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Luffy's two dominant traits are his apparent lack of intelligence and his utter fearlessness. Luffy can easily be amazed by the simplest things, such as hermit crabs, and can be confused by concepts such as that by digging a hole right next to another he may be unintentionally filling the other hole. He likes monsters and will ask weird creatures to join his crew (as seen in the Thriller Bark Arc, asking a talking tree to join his crew). He also has no knowledge of medicine: when Nami had a high fever he told her to eat cold food and later tried to make Roronoa Zoro better (after battling Bartholomew Kuma) by pouring sake onto him because Zoro likes sake. When attempting to think up a plan to get off of Amazon Lily, while he managed to make some logical sense of where to look, he is seen to strain himself and notes that he is going to feel sick from too much thinking. He is rarely disturbed by violence or blood as he has fought his whole life. Even the worst battlefields rarely disturb him except when it involves a friend or relative as in the case of Ace. He is seemingly unphased by the most horrifying sights such as headless men left after Law's attacks or the extreme violence of Kid.
His simple mind actually saved him against Hancock's powers because he mistook it for a "Noro Noro Beam", which was used by Foxy, which brought out a fear of being slowed down (though it is shown later he is simply immune to her powers, because of his pure heart). If Luffy finds something he does not understand, even if someone explains in detail, he calls it a "mystery thing"; like calling Dance Powder a "mystery powder". One of Luffy's running gags is asking "non-humans" such as Keimi and Brook if they can poop, in which case the answer is usually a yes. Another running gag is Luffy's slow reaction time, especially to freezing temperatures.
He is, however, a genius when it comes to fighting, such as when he figured out how to defeat Crocodile's Devil Fruit power on the verge of death, how to use Soru from sight, developed a number of effective counters to Enel's "Mantra" ability and, most recently, learning everything Silvers Rayleigh had to teach him about Haki in a year and a half (even though Rayleigh mentioned that two years were too short a time to learn about Haki). He does have a habit of holding a grudge even in dire situations, such as calling Franky a "bastard" in the middle of his fight with Rob Lucci causing Franky to retort "Now's not the time to be mad at me" and refusing to let Crocodile help him escape Impel Down (even when there was no alternative). However he tries not to hurt civilians and people he likes, even if they intend to do harm to him, preferring to run from them than fight.
It has been stated more than once that Luffy's instinct and behavior is similar to that of a wild animal's, like when he knows who he has to fight before he even gets to the battle. Even his fights show this as he relies on his instincts and counterattacks, which complements the way he views the world. He is most often seen smiling, except in a fight where he is forced to use all his power (and sometimes even then). Luffy also seems to rarely change personality wise. Because he views the world in a straightforward and simple manner, he is occasionally the only person who can see past events that have taken place and realize the true goal, yet at other times he can fall into the simplest of traps.
When drawing him, Oda has said he tries to make Luffy very straightforward about what he wants to be and how he feels, which is why out of all the main characters, he has the least number of thought bubbles, since he acts and says what he wants to do rather than think it. To complement Luffy's naïveté and straightforward attitude, there is a running gag through the series where Luffy can identify similarities on things that have little resemblance (like being able to see the resemblance between Sanji and his Wanted Poster, or being able to see Spoil as an old man with major wounds rather than a zombie), but is unable to see similarities with things with obvious connections (like being unable to tell that Sogeking is Usopp or not seeing through Foxy's pathetic disguises).
Luffy's simple attitude and naïve comments during fights are often mistaken by his opponents as poking fun at them. Due to this, many of his opponents lose their cool and charge at him in anger. While he is goofy and reckless, he gets quite serious when anyone is in serious danger, notably his crew, whom he considers his family. Luffy also has the tendency to unwittingly poke fun at an opponent's most sensitive trait, like calling Buggy "big nose", Alvida "the fat lady", and Kureha "old hag". In many cases, the opponents fail to understand whether Luffy is serious or just playing during fights due to his bizarre actions like drinking too much water in his fight with Crocodile or punching out Arlong's teeth and using it as a weapon to bite him. Luffy, however, has maintained that he is always serious during fights. In most cases, once he starts to fight he maintains a serious attitude and is only seen laughing once he defeats the enemy or is certain the enemy will be defeated, like in Buggy's case when he laughed before sending Buggy flying in the air.
Every time Luffy defeats an enemy, he smiles shortly afterward. There has been only one exception: after his fight with Usopp in Water 7, Luffy did not smile for a whole day.
In battle, Luffy has shown signs of intelligence, high tactical and innovative skills. He can easily adapt to hindering situations such as Mr. 3's Candle Lock or Enel's Gloam Paddling into an attack. He also used a mirror to reflect Foxy's Noro Noro Beam attack. During the Marineford Arc, Dracule Mihawk mentions that Luffy seems unusually clear-headed by avoiding Mihawk's attacks. Additionally, during his battle against Mihawk, he uses Buggy as a scapegoat shield to help protect him and move forward towards Ace. Luffy also has a habit of saying things with a lot more weight and (occasionally) wisdom than he realizes without even thinking or meaning to.
Luffy also shows significant leadership skills, which at other times he usually lacks and therefore has his captain duties done by another crew member. An example of his leadership is usually present at the most dire and serious times. Such as in the Water 7 Arc in which a portion of the Straw Hats, some Galley-La foremen, and the Franky Family are present. Luffy brings the three together by pointing out that they now have a common enemy and should form an alliance to take back what the enemy has taken. Another time could be when he takes on the burden of being a Captain and does not hold back when dueling Usopp, and restrains himself from calling Usopp back afterwards. Crew members also listen to his orders without question when he is serious, all respecting his position. In the Sabaody Archipelago Arc, Jewelry Bonney comments on how not just anyone could order Zoro around, since Zoro seemed to be so independent and ruthless. Yet he respects Luffy's commands when the time calls for it.
The one thing that Luffy does not allow is someone or something getting involved in another person's fight. At these times Luffy shows both remarkable restraint during the battles, and rage when something or someone outside the battle is involved, especially if it is a person he considers a friend. Luffy showed this early in the series when Zoro fought Mihawk, and managed to hold himself (and Johnny and Yosaku) back until Zoro was defeated. Since then he has shown it several times, like when Baroque Works sabotaged the giants' duel on Little Garden; when Crocodile attacked Yuba with a sandstorm in the middle of their fight; when he challenged Aokiji to a 1-on-1 fight; when he fought Lucci and insisted that Franky does not get involved in their battle; when the Boa sisters threatened to break the petrified form of his saviors; and when he was visibly enraged with Hody Jones who attacked some civilians who tried to halt Noah. He even went so far as to cover Sandersonia's back from the citizens of Kuja while it was still burning, even though they were trying to kill him, claiming it has nothing to do with their fight.
Luffy is very loyal to his crew-mates and other friends, and can lose his temper quickly if they are harmed in any way (a trait that he apparently shares with the late Pirate King). Luffy is willing to do drastic things to avenge and defend those dear to him, even if it means breaking a promise to his friends, such as striking Bellamy down for attacking Montblanc Cricket's crew, and punching World Noble Saint Charloss in the face for shooting Hatchan, despite promising not to defy the World Nobles. Additionally, Luffy believes that all people should be loyal to their friends, and if Luffy sees anyone betraying their own comrades, he would stand up for the victims (even if they are enemies). Notable examples of this are Captain Kuro killing his own crew, Don Krieg attacking Gin, Boa Hancock petrifying her fellow Kuja tribe members, Caesar Clown using his subordinates as mere guinea pigs, Donquixote Doflamingo treating Bellamy cruelly despite the latter's admiration for the former, and Big Mom attempting to betray and murder the entire Vinsmoke Family to obtain the technology they possess. Sanji even pointed out during his fight with Vergo that he was the type of person Luffy would hate the most due to the vice admiral's betrayal of G-5 and attacking his subordinates despite their admiration for him.
Luffy's apparent selflessness often inspires others to side with him as a result. Notable among these people are Boa Hancock, Jinbe, and Emporio Ivankov, who would not have helped him out otherwise, given their individual beliefs. He also shows respect for things that a person is willing to die for, be it a treasure or a secret, to the point of even fighting to protect that which the person would throw their lives away over. The most noticeable action of this would be when he protected the Gorgon Sisters' secret by using his own body to cover the mark on Boa Sandersonia's back, even though they were trying to kill him.
However, despite all his peculiar traits and habits (with his trademark dimwitted behavior), Luffy's most defining part of his personality is the ability to make allies out of absolutely anyone (including former enemies, villains and even Whitebeard himself), which is said by Mihawk to be the most dangerous ability in the world.
When other individuals heard Luffy mention that he, his crew, and the people they meet are friends or comrades, it touched the hearts of others who were later grateful to Luffy and his crew and support them, like Carue, Vivi, Nefeltari Cobra, and Fukaboshi. That also applies to Nami and Chopper who later joined the Straw Hat Pirates.
It is shown that Luffy can get irritated when his crew or people around him constantly whine about the dangers they are in that he caused, which is mostly shown in Zou. He would appreciate if people stayed happy and cheery in these situations, like the rabbit mink Carrot.
Luffy also has an extreme thirst for adventure, which he has stated is the main reason he wants to become the Pirate King, having the belief that the Pirate King would be the one on the entire ocean with the most freedom for adventuring. Because of this adventurous nature, he tends to avoid taking 'the easy way out' at times, such as when he destroyed the Eternal Pose to Nanimonai Island given to him by Robin (Miss All-Sunday at the time), stating that he did not want an enemy to decide his destination. He also has no intention of trying to learn what or where One Piece actually is until he finds it himself, and once stated he would quit being a pirate if his crew tried to find out, not wanting to 'go on a boring adventure'. Luffy has no actual sense of caution and in fact, has been known to literally laugh in the face of danger and walk into potentially harmful situations with a massive grin as, for example, when the Straw Hats approached the Knock-Up Stream and when they decided to board the Rumbar Pirates ghost ship and also when entering Thriller Bark and while descending to Fishman Island, Luffy never says goodbye to those he considers friends, in hopes of seeing them again.
As a person with the middle initial D., Luffy shares the common trait of not fearing death. He will often state that if he reaches his goal, that's fine, but if he dies on the way, that's fine too. He even smiled when he was nearly executed by Buggy in Loguetown, although he did have a look of shock and surprise in his eyes before this happened when Sanji and Zoro tried to rescue him. Throughout the series, several characters have stated similarities between Luffy and other D. carriers, whether in personality, words, actions or presence. So far he is thought to be similar to Jaguar D. Saul by Nico Robin; to Monkey D. Garp by Aokiji, by at least one of the Gorosei, and by his own crew; to Monkey D. Dragon by Emporio Ivankov; and to Gol D. Roger himself by Smoker, Crocus, Kureha, Gan Fall, Shanks, Rayleigh, Kokoro and the non-canonical Raoul.
Luffy is also willing to recklessly put his own health and safety at risk to protect those he cares about, even if it means risking death or causing a permanent injury to himself, such as overexerting himself during his the Battle of Marineford to save Ace and begging Emporio Ivankov to use tension hormones on him again as he would rather risk his health and try to save Ace, or Luffy will kill himself if he allows Ace to die. . Other examples are Luffy repeatedly attacking Noah with Gear Third to save Fishman Island, despite rapid blood loss from the injury Hody Jones inflicted on him, and Luffy willing to risk losing his arms to break free from his restraints in Big Mom's cell to save Sanji, after learning Sanji's wedding is a set-up and the Charlotte Family intends to kill him (along with his family), though this was prior to Jinbe showing up to free him and Nami.
Luffy's personality is like that of a child's, in the sense that he tends to go to the extremes. He can either be extremely greedy, especially in cases of food, who his crew is, and adventure; or extraordinarily selfless, going so far as to virtually sacrifice himself to avenge or protect his friends, crew, and family. This childish mentality of his allows him to get to the root of the problem, and allows him to figure out the most simple way of solving it.
Like other D's so far, he is also quite a glutton despite his skinny appearance: he especially loves meat and can eat a fish whole - bones included - and because of this, a running gag of Luffy's is him constantly stealing other peoples' food with his rubber powers, causing them to yell at him and sometimes hit him. It should also be noted that he becomes more gluttonous over the series as there are moments he becomes morbidly obese, though he loses the weight in some way, usually exercise. Also, after the events of Enies Lobby, Luffy seems to have developed narcolepsy, much like his brother Ace, though for only a short time.
Another running gag is his habit of being amazed at various abilities of villains, often yelling out "amazing" with stars in his eyes and around his head. Luffy believes that he is at his "coolest" when he is wearing armor. Luffy also seems to have a slight obsession when it comes to outfitting himself with full-body armors, and has a habit of wearing one whenever he gets the chance. But every armor that he manages to find and outfit himself with usually ends up destroyed either in a battle or by some other comedic scenario. He also constantly insults his opponents by giving them degrading nicknames (such as calling Gekko Moriah a "leek" or Enel "earlobes"). Luffy apparently has no skill with insulting people, usually taking either a physical aspect or unique ability and trying to make it degrading (like calling Zoro "three-swords style" when everyone was lamenting Vivi's absence, only to be corrected by Usopp).
Luffy also has absolutely no talent for lying whatsoever, and cannot hold a straight face or poker face at all when intimidated to confess the truth. In fact, more often than not, Luffy would blurt out, without thinking, what he knows regarding a certain event whenever someone asks something concerning the events that transpired. In contrast, Luffy has a tendency to suck his lips in and turn his head to the side when an attack or technique fails to affect him, such as Enel's various electrical attacks or Boa Hancock's Mero Mero no Mi.
Luffy never kills any of his enemies (no matter how cold-hearted they are); instead, he frequently sends the enemy flying, knocking them out or beating them until they have reached the point that they are almost near death. Oda explains that it is not a question of morality so much as a matter of punishing the villains for their crimes - he feels that killing the villains lets them off too easily, whereas he considers letting them live to see their dreams ruined a far more fitting punishment; however, it is evidently clear that Luffy is not against others completing the final act themselves, as seen when Luffy allowed Law to make his attempt to kill Doflamingo, while making sure Trebol does not interfere, however this may have been more to do with stopping Doflamingo's birdcage (which would only deactivate if Doflamingo willed it or was dead or unconscious) from killing civilians than actually harboring any desire to see Doflamingo killed. Ironically though, some of the people he has defeated have become good after their defeat, most noticeably Wapol becoming a rich CEO of a toy factory, though he became evil once again after he created his new kingdom.
Another dominant trait of Luffy is his humble nature: he does not brag about the powerful foes he's defeated in the past, though he's not above about claiming that no one has ever beaten him in the past (which is not true, having been defeated many times by Ace and Sabo as a child, twice by Smoker (though non-fatal), twice by Crocodile before defeating him, once by Aokiji, once by Rob Lucci before defeating him, once by Gekko Moriah before defeating him, once by Bartholomew Kuma, once by Magellan and once by Kizaru, all in the past). He remains humble despite having done outrageous acts like defeating Shichibukai-level pirates and issuing the order to burn down the World Government Flag back at Enies Lobby. When Franky pointed out the latter, Luffy only replied that it was nothing to get worked up over (hinting that he only gave the order on a mere whim), for he and his crew were only there to take back a crew member that was taken from them. When Sengoku tried to cover up Gekko Moriah's defeat by ordering Bartholomew Kuma to kill the Straw Hat Crew, Vice Admiral Garp told him, "Ah, do not worry yourself Sengoku! Luffy is not the sort of guy who'd go around boasting about taking out Moriah anyway!".
Prior to the timeskip, Luffy had displayed a side to himself where he occasionally gets into fights with others over needless issues (i.e. he nearly got into one with Blackbeard in Mock Town over a matter of quality of the pies that the tavern served to their patrons). He still has this trait after the timeskip when he is shown to fight with Momonosuke when he arrives on Dressrosa. However when Luffy is told to keep a low profile or to restrain himself he will resist his urges to pick fights over small matters. Despite his passion for fighting, Luffy also generally refuses to fight someone that he does not personally consider an enemy, preferring to either talk it over or run away from the confrontation. Over the series Luffy has become more mature and levelheaded, though he only shows this part of his personality when he and his friends are in dire situations or someone insults him, calling people like him and their beliefs foolish; other than that he still acts the same as he was at the start of the series.
He almost never gets irritated with normal people, though there are a few exceptions, like when they seem to have an opposite taste in food as he, or when they ask if they can take a look at his "privates". Luffy also has no problem with other people stretching and playing with his rubber body, however, he does get a little irritated if they are doing so while he's in the middle of eating. Luffy calls every mixed-appearance creature he finds by whichever creature is its secondary (non-dominant) part. On Gaimon's island, the dog/chicken was referred to as a chicken when it was mostly a dog, the snake/rabbit a rabbit even though it was mostly snake, and the pig/lion a lion even though it was mostly pig. This becomes a running gag: later when he meets Bananawani, he calls them bananas with crocodiles attached to them. Also, after seeing Pierre transform, he continued to refer to him as a "horse" instead of a bird. And related to this running gag, when on Long Ring Long Land island, he called every animal by what he thought they resembled rather than the actual species they were.
Luffy's interest in women is a complex matter: in an SBS, Oda stated that the reason Luffy acted in an aroused manner when Nami stripped, yet remained neutral when Hancock did so, was that he was with Usopp at the time Nami did so, as Usopp is his age and a bad influence on his behavior. He also hasn't yet displayed any romantic inclinations, having nonchalantly refused to marry Hancock without a second thought. Ironically, despite his lack of interest in all things love related, Luffy has earned the affections of many women along his travels (such as Alvida's admiration, the love of Boa Hancock, etc.), quite a few of whom are royalty.
Luffy also respects his friends' decision if they choose not to join his crew, even if he asked them more than once, and would prefer not to forcibly take them with him. One example is his declining Zeff's offer to forcibly take Sanji with him, aware of much the Baratie meant to Sanji, and would only take him if Sanji agreed to do so. One minor exception is the Straw Hats' involvement in using more forcible methods in getting Franky to agree to join only because Iceburg insisted there was no other way due to Franky being too stubborn to listen to reason. This leads to Luffy and most of his crew to help the other members of the Franky Family with their plan, allowing them to succeed in convincing Franky to join the Straw Hats (with some additional help from Iceburg who provided the necessary advice) and seeing the importance to fulfilling his dream.
Luffy has shown to admire heroes, though he has stated vehemently that he really does not want to be one, his reasoning more-or-less translating that the definition of a good hero is to be entirely selfless. Ironically, many of Luffy's actions are mostly selfless, with his selfishness mainly revolving around his gluttony and his thirst for adventure. This trait leaves everyone he meets with to think he is some kind of hero, but not by his own design. However, he is easily convinced by Jinbe for his plan of becoming a hero of the Fishman Island with an agreement of meat.
When his adoptive brother Ace was killed at Marineford, the mental strain of watching Ace die in his arms caused him to fall into a catatonic state. After waking from this state, Luffy flew into a rage and went on a destructive rampage to vent his grief and anger. Afterwards, Luffy re-evaluated himself and came to the conclusion that he had been too naïve, and was weak and unworthy of becoming Pirate King, falling into a state of depression and self-pity. Some encouragement from Jinbe and Rayleigh gave Luffy some renewed courage to continue pursuing his dream. After the timeskip, he tells Rayleigh that he will be Pirate King, having regained his confidence to fight for his dream.
Whenever Luffy is seriously injured he always requests that his friends or allies get treated first, even when he is the one who needs it the most. The greatest example of this is when in Impel Down, after being severely poisoned by Magellan and getting to Level 5 with an injured Bentham and meeting Ivankov and Inazuma, he begged them to save his friend first even though he was truly suffering the most and in the worst condition (he was actually on the verge of death, and would have certainly died had Inazuma not found them).
Also, as a bit of a running gag, Luffy, when talking about money, tells his crew-mates to budget their money, only for them to react in return that it all goes towards feeding him. Another running gag involves Luffy randomly telling someone a secret, such as the identity of his and Ace's fathers, only to casually ask them to keep it a secret afterwards. He shares this trait with his grandfather.
Because he is the Captain and recruited all the crew mates personally, Luffy cares tremendously for his crew. As far as captaincy is concerned, Luffy sees his other crew mates as equals in contrast to other pirate captains, who mostly sees theirs as subordinate underlings (his crew mostly calls him by name, rather than with an honorific or "Captain"). In fact, it could be argued that he is the only one that is generally beaten up and ordered around on the ship as several members of the crew have shown, especially Nami who never hesitates to give Luffy a beating for his idiocy (albeit, in comedic fashion). This is something of a contrast between him and his grandfather's way of commanding a group. While Garp (who is even more absent minded) responds by mercilessly beating up his subordinates for showing him disrespect and to keep them in line (even if he himself did do something foolish), Luffy lets their disrespect slide. Luffy only pulls rank when he wants to go "adventuring", despite what his crew thinks. Examples being when wanting to go to Skypiea and following the swaying needle to the New World.
Much like his idol, Shanks, Luffy is the kind of benevolent pirate captain who does not seek to actively harm others unless they give him and his crew (or anyone he cares about) a very good reason to. However, during the Jaya arc he was willing to start a fight with Blackbeard over a difference in opinion on pie. As the Straw Hat Captain, Luffy has utmost faith in his crew. In fact, after the timeskip, Luffy's trust grew even more as shown when he overheard that his crew were being apprehended by the Ryugu Kingdom's guards, he did not seem perturbed at all, and was confident that his friends could take care of themselves. This is seen once more when he accepts Law's proposal for an alliance. When his crew confronts him about it, he claims that even if Law is untrustworthy, he is not worried because of the faith he has in his crew and the training they put in during the time-skip, eliciting a shock from them before reacting positively to his praise. Luffy also has the rare ability to cheer up just about anyone with his idiotic antics, even pulling a smile every now and then from the serious Zoro and Robin.
In turn, his crew, while often frustrated at his immature and impulsive nature, trust him unconditionally. They also show great concern for him when he is put in life-threatening situations. It can be said that Luffy has both greatly impacted and changed the lives of each of his crew members and is typically the one cited as having revived each of their dreams.
During his battle with Lucci, even though Luffy knew his crew were in danger (courtesy of Lucci flooding the tunnel) he kept fighting Lucci because they would manage and because Luffy knew that if he let Lucci get away, he would definitely kill all of his crew. This focus caused Lucci to compliment him on his leadership skills.
Though all of Luffy's crew tries to look out for him, due to Luffy's reckless and carefree attitude, on numerous occasions a crew member might wonder why they followed such a crazy captain. However, by the end of the day (or adventure), none of them truly regret following him and generally enjoy being in the crew. He likes to make fun of others' imperfections and character traits, such as Zoro's bad sense of direction (though he is barely better). Luffy also likes to comically imitate his crew members, and sometimes even himself; despite nearly dying from being frozen by Aokiji, he covered himself in flour and hopped while frozen in a pose to imitate the experience.
His level of trust and friendship with his crew is so high that he would even offer them a chance to eat the Mera Mera no Mi, which once belonged to his beloved foster brother, while the thought of it ending up in the stomach of some stranger was unbearable.
Despite the trust he has in his crew, he can get annoyed with their constant whining whenever they are put in constant danger that he starts, which has been shown during the timeskip.
The Straw HatEdit
Luffy has a very bizarre relationship with his signature Straw Hat. The original owner was Gol D. Roger himself as told by Silvers Rayleigh. Eventually, it was given to Shanks, who passed it down to Luffy after saving him from a giant Sea King, on the condition that he take care of it, never lose it and only return it when he became better than Shanks. The hat cements Luffy's promise to become the Pirate King and has been with him for over ten years. Subsequently, it has been repaired several times (mostly by Nami). In the beginning of the series, Luffy let people hold the hat during battle for fear of losing it, and whoever held it was considered to have his highest trust and respect. He has only entrusted it to Zoro when entering the Grand Line, Usopp during the Davy Back Fight, and to Nami during the Arlong Park, Drum Island, Jaya and Skypiea Arcs. As his fighting style got better, a string was added (most probably by Nami) so that he could keep his hat on without losing it.
The straw hat has become an identifying marker for him by his enemies, to the point where his nickname became "Straw Hat Luffy" and his crew the "Straw Hat Pirates". Luffy is almost never seen without it, even when sleeping or fighting. His love for the hat is so strong, he is willing to kill anyone who tries to damage it, and during the fourth movie he actually cried a small waterfall when it went missing.
The first crew mate to join the Straw Hat Pirates was Zoro, a bounty hunter who decided to serve under Luffy as a pirate after he saved his life from a dishonorable death at the hands of a corrupt Marine, but vowed if Luffy ever got in the way of his ambition, he will kill him. Later in the series, they have developed a very close bond which is underlined by their tremendous amount of trust and respect for one another, to the point where Zoro is willing to die for Luffy's dream to become Pirate King and sacrifice his own dream of becoming the world's greatest swordsman. Though, he still hints at Luffy needing to uphold his duties and capabilities as captain, such as when he jokes that if Luffy were not at least able to defeat at least half of the New Fishman Pirates, he'd have to step down as captain of the crew.
Luffy and Zoro are known to occasionally mock each other; Luffy will laugh heartily whenever Zoro gets lost or does something noticeably stupid, though he is usually worse in that respect. Zoro like the rest of the crew will reprimand Luffy for his idiotic habits. When Luffy and he battled in Whiskey Peak (as Luffy thought Zoro was attacking innocent people when they were actually bounty hunters), Zoro was exasperated with his Captain for not understanding the situation and decided to not hold back. When the battle was stopped by Nami, who explained the situation to Luffy, he laughed as he thought Zoro attacked people for giving food he did not like to which Zoro responded angrily "Who do you think I am?".
In times of trouble, Zoro has also served as an adviser to Luffy as to what course of action they should take. This is best illustrated during the events at Water 7 when Luffy was initially willing to have Usopp rejoin straight away, only for Zoro to explain what that would mean for the crew. Luffy accepted Zoro's determination as he denied Usopp's comeback when the liar wasn't admitting his stubborness. Luffy has great trust and admiration for Zoro's supreme sword skills such as when they were onboard Rocket Man and obstacles were in their way Luffy states to the Franky Family "Zoro's got this" as the Swordsmen sliced everything (including T-Bone) out of their way. Later in the New World Zoro was also the one to realize Luffy's recklessness would have to stop, going out of his way to reprimand his captain for behaving that way and making it clear they needed to take things more seriously in order to survive, with Luffy understanding it and apologizing.Luffy will sometimes mock Zoro for acting like he doesn't care about certain crewmembers like in Zou when Sanji was in a predicament and Luffy found Zoro listening outside the door he joked that Zoro was worried about Sanji, the Swordsman responded by saying "Don't make me kick your ass".
At Thriller Bark, Zoro decided to give up his life to save Luffy from Bartholomew Kuma because he was ready to die for the dream of his captain. Kuma found this trust admirable as he was moved by Zoro's compassion.
Though she respects him as a captain, Nami often scolds Luffy's airheadedness, but he never gets angry at her, even when she manipulates him. Luffy also has no problems taking orders from her when it comes to the navigation of the ship. Even though he is made of rubber, Luffy can still get hurt by Nami's physical attacks as she beats him up either by angering or annoying her. Despite the slight conflict occurring because of his recklessness, she has deep trust in him and views him as a great source of strength and comfort. When Nami fell sick just prior to the Drum Island Arc, and without a doctor on board, Luffy desperately tried to help Nami the only way he knew how. He consistently stayed by her side, and attempted to get her to smile, becoming sad when he wasn't successful, trying to keep the promise he made to Genzo. When it was determined that the only way to get her treatment was actually climbing the Drum Mountains by foot, she implicitly trusted Luffy to get her there safely. Luffy barehandedly climbed the 5000 meter tall mountain to get her to a doctor, with enhanced pain caused by the reaction of rubber to cold.
Even though Nami betrayed him when she stole their ship and treasure during the chaos at Baratie, Luffy never changed his opinion of her, insisting that she become the navigator in his crew. Oddly, he seems to place the most trust in her out of all of his crewmates - after learning from Johnny that he witnessed Nami killing Usopp, he refused to believe him, even going so far as to threaten him with a beating for "lying". In a similar situation in Whiskey Peak, where he was told that Zoro had killed and hurt the people who fed him, Luffy outright attacked him, even though that information came from an unreliable source (unlike the case with Nami). While he is normally oblivious, Luffy is still occasionally wary of angering Nami. When he heard Absalom was going to marry her Luffy simply said "He wants to marry Nami? He's brave".
Even without knowing anything about the horrible past she suffered, seeing her cry was enough for Luffy to place his hat on her head to console her as he went berserk on Arlong and his crew, similarly to how Gol D. Roger acted. Nami is the only person that Luffy places his straw hat on as source of comfort to her.
Luffy's relationship with Usopp is perhaps the closest example on the ship of a sibling relationship because of their similar pasts and fun loving mindsets. Despite his fears, Usopp at times finds the strength within himself by following the example set by Luffy and the rest of the crew. When he exclaimed that he was good with cannons, Luffy immediately made him the gunner of the ship. Usopp and Luffy are also destined to cross paths with the Red Hair Pirates in the future in some manner; Luffy to reunite with Shanks, and Usopp with his father. Luffy and Usopp are notorious for being the "idiots of the crew" and will set bad example for the youngest Chopper. During the Davy Back Arc he showed a strong trust in Usopp by allowing him to care for his Straw Hat while Luffy sported the afro, something he'd only allowed Nami to do before.
Their relationship faced a great turmoil when Luffy was forced to fight Usopp during the tragic events Of Water 7 over the fate of the broken Going Merry, and Luffy is emotionally distraught. Luffy engages in brutal combat with his best friend and took a surprising amount of damage from the Sniper's tricks before finally ending the battle with a Gomu Gomu No Bullet. Though Usopp lost the fight, Luffy gives him what he wanted (the Going Merry) and he and Usopp cried deeply over their briefly broken friendship. Luffy remained depressed along with Chopper and Nami about the event, but after the events of Enies Lobby tearfully and joyfully accepted him back when he later apologized and begged to rejoin the crew. He was willing to do this without an apology however, due to how much he missed him.
Usopp felt deep sorrow for Luffy when he lost his brother, and dedicated his timeskip training to getting stronger for him. He now has a lot more confidence in his ability, and so does Luffy. He stops Trafalgar Law from attempting to apprehend Caesar Clown after the events of Punk Hazard, reminding him that the sniper said he could handle it. He displays this again during Dressrosa, when he doesn't question in the slightest that Usopp can get the job done when he learns of his role in the Tontatta's plans. He was also happy to hear Cavendish praising Usopp for saving him from the life as a toy slave.
He adores Sanji's cooking, especially meat, dropping anything he's doing for a meal despite Sanji's claim that he puts considerably less effort into Luffy's food than the meals he prepares for the women. Sanji will cook any animal that Luffy catches, but is also usually the one who has to "discipline" Luffy whenever food is stolen (usually by kicking his captain around whenever food is pinched). Despite this, Sanji put his life on the line for Luffy's sake when Bartholomew Kuma had them weakened. Sanji has rescued Luffy from drowning more than any other crew member and trusts Luffy to defeat the enemies Sanji himself has trouble against. Before Sanji became part of Luffy's crew, he stated that Luffy's dream was foolish, but acknowledges that his own dream is foolish as well.
Though Sanji finds Luffy stupid at times, there is an underlying and often unspoken understanding that Sanji has great loyalty and respect for Luffy, his ideals and his dreams. In addition to being willing to trade his life for Luffy's, he declared to Capone Bege his belief that Luffy would become Pirate King, and that he would never do anything that would endanger Luffy's dream. Upon meeting Charlotte Pudding (Sanji's betrothed), Luffy (along with Nami, Chopper and Brook) learned that Sanji had turned down Pudding in order to be able to return to the Straw Hats. Luffy and the others were all greatly shocked to hear that Sanji would turn down a woman - especially such a beautiful and (seemingly) kind one - in order to continue adventuring with them, which moves Luffy so much that he starts crying. Sanji has also demonstrated his respect for Luffy's position as the crew's captain. He backed Zoro in telling Luffy that Usopp had to apologize for disrespecting Luffy's decisions before being allowed back on the crew. Additionally, after a duel between them, Sanji tells Luffy that, by insulting and attacking his captain, he had forfeited his right to return to his captain's ship.
Luffy reciprocates Sanji's loyalty and respect by tasking Sanji to be the temporary captain of the Thousand Sunny while Luffy fought in Dressrosa; this task included not only protecting the ship and crew, but also battling a Yonko's crew and reaching Zou. This outstanding trust continued when Luffy landed in Zou to find Sanji absent, with Luffy (along with Zoro) trusting that the cook would "look after himself" despite Nami's protests. Luffy later attacked Charlotte Cracker for insulting Sanji's loyalty, by suggesting that Sanji looked down on the crew due to their inferior social status, and that he would choose a comfortable married life over returning to the crew. Even after Sanji instigated a duel between them, Luffy refused to back down, defend, or retaliate; afterwards, Luffy declared that he knew Sanji's insults about the crew were all lies. Completely unlike his fight with Usopp, Luffy refused to hurt his cook and stated that he would not move or eat anything other than Sanji's cooking, until Sanji's returned. He also claimed that he couldn't become the Pirate King without Sanji, causing Sanji to break down in tears.
As with Nami, Robin and partly Usopp, Luffy was quick to respond when it seemed that Sanji was on the verge of leaving the crew. While Luffy was initially happy to accept Sanji's intended bride as part of the crew, as long as Sanji himself returned, he quickly learned from Pekoms that the arranged marriage would entail Sanji joining the Big Mom Pirates. In response, Luffy yelled at the lion Mink, saying that he would never allow that to happen, and proceeded to lead the Sanji retrieval team into Big Mom's territory, risking conflict with both a Yonko and an infamous Underworld army in order to get Sanji back. After getting captured and learning of Big Mom's true plan to assassinate Sanji, Luffy became enraged and tried to rip his own arms off in order to escape and warn Sanji. After being freed by Jinbe, Luffy's first thought was rescuing Sanji, despite his injuries and hunger, and he rushed through Big Mom's palace searching for him. After Reiju informed him that Sanji became aware of Pudding's plan, a relieved Luffy decided to return to the spot where he promised to wait for Sanji.
Just as he did with Nami and Chopper at Punk Hazard, Luffy understood when a decision was important to Sanji, and decided to support that decision. When Sanji stated that he could not leave Whole Cake Island with Luffy after learning of Big Mom's plot to assassinate his family, Luffy responded simply that was who Sanji was, and that he and the Straw Hats would help Sanji wreck Big Mom's plans.
Tony Tony ChopperEdit
Chopper, as the youngest of the crew, often joins him and Usopp in singing and fooling around, and he credits Luffy for helping him find the courage to go on adventures. Luffy accepted Chopper as a person and didn't treat him like a monster as so many others did and corrected Chopper when he said he didn't have any friends by shouting "You're wrong reindeer, I'm your friend!" this caused a great impact on Chopper causing him to love Luffy like a big brother. Chopper also often tends to jump after Luffy whenever his captain starts drowning, despite also being unable to swim due to having eaten a Devil Fruit as well. Luffy has deep faith in Chopper's doctoring skills, as when he explained that the "candy" that the giant children were eating was in fact a dangerous drug, he broke a promise with one of them to bring some more "candy". 
Chopper devoted himself to "becoming a real monster" during the timeskip, no longer afraid to be feared as long as he can be of help to Luffy.
Luffy and Nico Robin first began as enemies, but after Robin saves his life in Alabasta, Luffy grows to trust her more deeply which he shows by allowing Robin to join his crew without any reluctance. Robin is especially grateful to him for taking her in despite the risks it involved, as well as for pursuing her all the way to Enies Lobby and directly opposing the World Government. At Water 7, Luffy reveals that he is very impressed by Robin's intelligence when he is talking about her with the mayor Iceburg. As such, Luffy always turns to Robin for explanation whenever they encounter an unfamiliar person, place, or thing. At first she joined the crew because Luffy had saved her life when she wished to die, and had nowhere else to go, but eventually all of the crew members became important to her personally. Out of all the crew members, Robin is the most tolerant of Luffy's silly behavior, and actually finds him amusing. Robin is also one of the few members of the crew who unquestioningly follows Luffy into any dangerous adventure he wants to embark on.
Luffy initially did not like Franky, with the latter's robbery of Usopp, despite Luffy and Usopp not being on the best of terms themselves. This led to his distrust of Franky for a long while, before he eventually came around to the shipwright during the Enies Lobby Arc and Franky's eventually joining the Straw Hat Pirates. He is always amazed by Franky's building talent, and is often in awe of Franky's cyborg enhancements and modifications, a running gag among many males throughout the show. He also deeply respects him as a man after he was willing to show his genitals to everyone without shame and begging Robin not to rip them off, so he would still be a man when he joins the crew. After the timeskip, with Franky looking and acting even more robotic, he has only become even more amazed. Especially with Franky's mecha Franky Shogun which Luffy holds in dumbfounded awe.
Upon hearing Ace's Mera Mera no Mi has resurfaced and was a grand prize in the Corrida Colosseum, Luffy offered Franky to eat it, showing a great deal of trust and friendship, though Franky refused due to not wanting to lose his ability to swim.
Luffy came to almost immediately befriend Brook up their meeting, even despite the rest of the Straw Hats distrusting and outright refusing Brook, whether due to the initial mysteries behind his form or simply his personality. Luffy's admiration and eventual trust for Brook was cemented in his offering Brook a place in his crew, Luffy's self-considered family.
As the musician of the crew, Brook is often requested by Luffy to perform a song. When requested to play by Momonosuke, he states that he will only respond to orders by his captain, before finally giving in and playing a song. Brook will often join Luffy, Usopp, and Chopper in immature antics, despite Brook being the oldest member of the crew at 90 years of age. Luffy had always stated that he wanted a musician in the crew, so Brook's job is very important to him. Brook often appears to enjoy Luffy's child-like antics and sometimes would even reinforce his humorous behaviour. Luffy is the only member of the crew to find Brook's skull jokes funny. This relationship is strengthened by the fact that Brook was part of the Rumbar Pirates, the crew that were such good friends with Laboon, and promised to meet up again.
Straw Hat Grand FleetEdit
The Straw Hat Grand Fleet was formed at the end of Dressrosa Arc, comprised of seven units, the Beautiful Pirates, the Barto Club, the Happo Navy, the XXX Gym Martial Arts Alliance, the Tonta Corps, the reborn Giant Warrior Pirates and the Yonta Maria Grand Fleet. Luffy initially turned down their offer for the alliance, as he finds such things as bothersome. After Luffy conveys to them that his ideal of Pirate King is not to be important, but to be free, the leaders were touched by this and decided to exercise their own free wills. They vowed themselves to be his underlings, without the Straw Hat captain having to be obligated to respond in turn. Though a bit annoyed at this, Luffy still accepts them to be his friends, promising to help them out if they are in a pinch.
Cavendish harbors a deep-seated resentment of the Supernovas, including Luffy, for stealing the spotlight from him. At first, Cavendish was friendly and sociable to him since Luffy was under the guise of "Lucy". However, right after learning his true identity, Cavendish immediately turned hostile and became hell bent on killing Luffy with his own hands. This hostile nature changed when Usopp helped in his transformation back to human from a toy, even to the point where he tells Luffy that he'll take down Doflamingo to pay the debt. Luffy seems to have grown to trust Cavendish as while facing Doflamingo, he stated he needed him to defend his friends though Cavendish agreed he misinterpreted this as Luffy being his "fan". Later on, Cavendish along with the other captains swore to serve under Luffy as they departed Dressrosa. Luffy often refers to Cavendish as "Cabbage".
Two years ago, in Loguetown, Bartolomeo witnessed Luffy survive execution at the hands of Buggy the Clown. From that moment forward, he followed all of the Straw Hats' adventures, growing more and more delighted at the crew's escapades. Bartolomeo feels great admiration for Luffy and his crew, referring to them as "Senpai". It is shown he will do anything to the point of cutting off a man's tongue for badmouthing Luffy and its revealed Bartolomeo's reason for wanting the Mera Mera no Mi was to give it to luffy as memento of his late brother Ace. He was also willing to fight Sabo (not knowing he was luffy's brother) for saying he wouldn't allow Luffy to have the devil fruit. Unlike the other fighters who pursued the bounties of Doflamingo's enemies during the "Birdcage", Bartolomeo did not betray the Straw Hats and continued to offer them aid throughout the conflict, even willing to sacrifice his own life for them. After the conflict on Dressrosa was finished, Bartolomeo along with the other captains swore to serve under the Straw Hats.
Bartolomeo and his crew even gave the Straw Hats a ride to Zou before parting ways. Luffy personally thanked Bartolomeo for his help, marking the first time he call the latter by his name, something that caused the latter to tear up.
Luffy first encountered Sai when he was accused of getting in a fight with Spartan at the Corrida Colosseum. Sai, who witnessed the act stood up for Luffy by declaring it was Spartan who started the fight and he should be the one to be disqualified. When Luffy thanked Sai the latter reacted belligerent and angry and even had to be restrained by his brother. Sai did not seem to hold a grudge toward Luffy for winning the Block C and even tried to get his attention for his grandfather to thank him for restoring his head. During the "Bird Cage", Sai and his family allied themselves with Luffy to defeat Doflamingo rather than go after the bounty on his head. After the conflict on Dressrosa was finished, Sai and the other captains swore to serve under the Straw Hats. Though he is grateful, he was one of those who got annoyed when Luffy first turned down the alliance and thought to incapacitate the 'commander' and force him to accept them.
Ideo first met Luffy as 'Lucy', his opponent in the Corrida Colosseum. However, after losing and being turned into a toy, and then promptly saved from that life, he ended up allying himself to the Straw Hat. Though Luffy has had little interaction with Ideo, the Longarm boxer is still grateful to have been saved and swore himself to be Luffy's underling. Despite this, he was one of those who got annoyed when Luffy first turned down the alliance and thought to incapacitate the 'commander' and force the Straw Hat to accept them.
Not much conversation is seen between the two of them, but due to being friends with Usopp, he quickly trusted Leo and the Tontattas. Leo was completely indebted to Luffy and the Straw Hats for ending Doflamingo's reign over Dressrosa. As a result, Leo asked permission from the Tontatta king to travel with him and become a representative for the Straw Hats. Even though Luffy declined the offer, Leo chose to pledge allegiance anyway. After celebrating a feast with the Straw Hats and their allies, Leo returned to Dressrosa with his fellow Tontattas and asked the people to build a statue of Luffy and Usopp in their honor, showing much admiration for them.
Though Luffy defeated Hajrudin during the Block C battle for hurting the Fighting Bull, the giant was willing to overlook this incident during the "Birdcage" game as he wished to repay his debts to Usopp for saving him from his toy transformation. After the conflict on Dressrosa was finished, Hajrudin was one of few captains who swore to serve under the Straw Hats.
During the events of the Birdcage game, Orlumbus allied with Luffy and the rest of their allies in order to end Doflamingo's reign over Dressrosa. After Doflamingo was defeated, Orlumbus decided to pledge his allegiance to Luffy, along with the rest of their allies. When Luffy declined the offer, he decided to pledge anyways and help him out whenever he needed it.
Monkey D. DragonEdit
Luffy has discovered that Dragon the Revolutionary, the most wanted man in the world, is his father. The two have yet to talk to each other. In fact, their only meeting was when Dragon rescued Luffy from being captured by Smoker in Loguetown, and the only thing Luffy said to him was "who's there?" while being pinned headfirst to the ground by Smoker. It is highly probable that Dragon cares for his son's life because he saved him in Loguetown and he always looked towards East Blue where his family lived. Dragon seems to expect great things from Luffy, much like his grandfather. However, unlike Garp, Dragon seems to be in favor of Luffy's decision to lead his own crew as a pirate, although he believes they will meet someday. Luffy was unaware of who Dragon was before he was told by Garp and did not understand what the revolutionaries are capable of doing to the world when told about it by Ivankov. So far Luffy has not mentioned anything about how he feels toward Dragon and his ideals, but he is fine with people knowing that he is Dragon's son.
During the Whole Cake Island Arc, Luffy reads a newspaper where he is able to see his father's face for the first time in his life. He is comically surprised to see the latter but casually remarks that Dragon doesn't look like him before admitting to being more worried about Sabo than his father when hearing that the Blackbeard Pirates attacked the Revolutionary Army.
Portgas D. AceEdit
"Fire-Fist" Ace and Luffy were immensely close to each other. They grew up together and fought every day, with Ace always winning even though Luffy had eaten a Devil Fruit. Luffy displayed no grudge against Ace for always winning, but instead boasted that he could win now (though he appears to still acknowledge that Ace is still the stronger of the two, he proclaimed during the war in Marineford that he will eventually surpass Ace one day). Despite the battles they fought, Ace was protective of Luffy from Garp's abusive nature even going as so far to insult him to stop abusing Luffy. As for Luffy, this protective streak is reciprocated, leading to him embarking on a one-man rescue mission to extract Ace from captivity in the one place regarded as the most secure prison of the world, Impel Down, after hearing of Ace's capture and subsequent imprisonment there. However, while they are exteremely loving brothers to each other, Luffy always made Ace angry and worried by doing reckless things. As such, Ace readily believed Boa Hancock when she told him that Luffy had broken in to the prison. Even near his death, Ace grew angry with Luffy's reckless infiltration of Impel Down, while the endangered Luffy was worried about Ace's safety so much he had even snuck in the world's greatest prison, lost 10 years of his life, and even risked his arms to attack Magellan.
Luffy's devotion and love for his brother were shown to extremes when he not only took on every Marine stationed at Marineford, but the three Admirals themselves, showing that nothing would stand between him and saving his brother, not even three of the most powerful Marines around, and even shouting out loud he would save Ace even if it killed him. While Ace regarded Luffy as his brother and even acted like it, it was revealed moments before his execution that Ace was a child of Gol D. Roger, and that he chose his mother, Portgas D. Rouge's surname, which makes them brothers through adoption. A flashback shows Luffy and Ace first meeting as young children, which means that Luffy was aware of this fact. When this happened, Luffy already had his signature straw hat and the scar under his left eye, which means it was after Shanks gave his straw hat to Luffy and left the Foosha Village. He had also gained his devil fruit powers by then, which happened when he was 7 years old. It is revealed in a flashback that Luffy was sent to live with Ace and his guardian Dadan after Shanks left, since Garp thought that living in Foosha Village had somehow made Luffy "too soft". Ace was quite hostile to Luffy at first, even spitting at him before they were introduced to each other. Luffy, however, constantly tried to make Ace his friend, following him everywhere and trying to make up.
Eventually, thanks to the "Sabo Incident" Ace mentioned before he died, Ace grew fond of Luffy and they officially became brothers. Sometime after meeting Ace he managed to find out that Ace was the son of Gol D. Roger. Though many were heartbroken when Ace died, none took it harder than Luffy; Luffy was so devastated that he suffered a mental collapse and became unresponsive to his surroundings, and would have been killed by Akainu if others had not defended him. Jinbe speculated that this comatose phase was a way for Luffy to defend his mind from the impact of the loss, and worried about how Luffy would act when he woke up. Indeed, when Luffy did wake up, all he could do was scream in agony and cry and wish it was all a nightmare, and that he would wake up soon. The loss of his brother also had a crucial impact on Luffy, leading him to think that he was not worthy of becoming the Pirate King for the first time in his life. He only came out of his depression after Jinbe made him realize that Ace had entrusted Luffy's safety to his crew. After the two year timeskip, Luffy has fully gotten over his grief as he was able to talk about Ace's death freely, although his hatred for the man who killed his brother apparently still remains. Nonetheless, Luffy accepts Ace's fate, but also finds comfort in the fact that Ace truly believed he could become the Pirate King.  Donquixote Doflamingo would later take possession of Ace's Mera Mera no Mi, an item which the Shichibukai was certain would draw Luffy to him, adding that Luffy would never allow anyone to gain the powers that once belonged to his beloved brother. Indeed, Luffy showed surprise when he heard of the fruit being handed out as a prize in a tournament and, not wanting it to go to just anyone, entered the tournament to win it. He was, however, fine if one of his crew members ate it, as he offered Franky the fruit. He has shown that he doesn't like it when Ace's death is made fun of as when Don Chinjao said that it was a wise move of the Marines to 'cleanse that demonic bloodline two years ago'. This angered Luffy to the point that he struck Chinjao with a Gomu Gomu no Thor Elephant Gun.
Monkey D. GarpEdit
Though the two of them get along fine, Luffy is utterly terrified of his grandfather Garp. This is due to the extreme training he was put through in his younger years in his bid to make Luffy a Marine, as well as Garp's tendency to punch Luffy to discipline him. Garp had high expectations for Luffy, but to Garp's dismay, Luffy did not share his grandfather's plans for his future. However, Garp respects Luffy as a great person, even if he is a pirate. He often brags about Luffy to his superior Sengoku, laughing whenever Luffy does something audacious and is prone to saying "That's my grandson" much to Sengoku's exasperation. When Sengoku was talking with Garp and Kuma, Garp said that Luffy is not the type of person to brag about defeating someone, arguing that Bartholomew Kuma did not need to kill Luffy to keep Moria's defeat a secret. When Luffy entered the battle of Marineford, Garp recognized him and looked shocked and horrified at the sight of his grandson entering the fearsome battle. Later, as the battle rages on, Garp merely looks resigned as his grandson furiously makes his way to the execution platform. When Luffy came close to the platform, Garp stands in his way in the name of his Marine duties. However, in the end, Garp chose family over his duties as he allowed Luffy to hit him and reach the execution platform to save Ace. He also tried to attack Admiral Akainu when Ace was killed by the admiral and Luffy was on the verge of being killed as well, but was stopped by Sengoku. As Garp has resigned from the Marines, he and Luffy are no longer enemies by law.
The mountain bandit, Curly Dadan, is Luffy and Ace's foster mother. She had been blackmailed by Garp into taking care of them, and did not seem pleased with having Luffy as her surrogate son, due to being already occupied with the troublesome Ace. Luffy, in turn, did not seem to like the Dadan family anymore than they liked him, due to his run-in with the bandit Higuma. However, as time passed, they came to care for each other, with Dadan coming in to save Luffy from Bluejam, and Luffy worrying for Dadan's safety. Luffy states that he hates bandits but he likes her.
Sabo was never an actual member of Luffy's family, but he, Luffy, and Ace shared a drink making them official brothers and establishing the deep bond between the three. They seem to be reasonably close, though not as deep as Ace and Luffy. This is however most likely because they did not spend as much time together with Sabo being taken away and they never saw each other again for 12 whole years. He still had a tendency to defend or save him when they were children hunting together. Even though when Sabo first met him he wanted to kill him for discovering their plans. According to Luffy, when they were young, Sabo was a nicer brother to him than Ace. After Sabo and Ace fought together against Porchemy to save Luffy's life they became friends. At this point they were seen after different events of stealing and hunting. Sabo was seen being taken back by his father, who recently revealed that he was the son of a Goa Kingdom Noble. They show a relationship of trust and love since he gave up and returned with his father so that Luffy and Ace would be safe from the hired pirate Bluejam. When Sabo's apparent death was reported by Dogra, Luffy cried all night until he fell asleep, showing the genuine love he had for his elder brother. Luffy only snapped out of this sorrowful moment when Ace told him to live proudly, as Sabo wanted. In a way, Sabo is one of the earliest contributors to the molding of Luffy's personality as a free spirit.
When Sabo and Luffy were reunited after twelve whole years, Luffy did not recognize him at first and even challenged him after hearing he won't let him have Ace's power. However, upon hearing the story of the day they became brothers, he reacted in shock as he realized the latter's identity. Luffy quickly embraced Sabo and began joyfully crying for a great deal of time after finding out his remaining brother was alive and well. Sabo thanked Luffy for surviving the Battle of Marineford and asked for permission to eat the Mera Mera no Mi which Luffy unhesitatingly allowed. When Jesus Burgess attempted to kill Luffy, Sabo quickly intercepted him and Luffy was happy to see his brother and even more so after seeing that Sabo inherited Ace's power. When Sabo was preparing to leave Dressrosa, he left Luffy a Vivre Card and entrusted Luffy's safety to the Straw Hats similar to what Ace once did.
During the Whole Cake Island Arc, Luffy expressed worry for Sabo's safety after learning the Revolutionary Army fought against the Blackbeard Pirates only calming down when Pedro mention the possibility of Sabo being okay due to there being no mention of him being killed or captured.
It is notable that Luffy has connections to some of the most powerful organizations or people, mostly through his extensive and famous family. His known family alone has him connected to powerful members in the Revolutionary Army, Marines, and Whitebeard. Besides his family, he has Shanks, Rayleigh, Boa Hancock, Jinbe, Coby, and Helmeppo, who connect him to another Yonko, Shichibukai, and again the Marines. As the Kingdom of Alabasta is an affiliate nation of the World Government, through Vivi (and by extension, Cobra), he may also possess some influence there. Therefore, of the reigning World Powers, the Gorosei is the only organization to which he is not somehow amicably connected.
Luffy befriends most of the civilians he meets on his journey, who normally fear him for being a pirate but hold him in admiration by the time he moves on to the next adventure. He can be naïve at times and is quick to befriend people, often calling people whom he has known less than a day his friends and being willing to go as far as necessary for them. During his journey, Luffy saved or freed civilians from the tyrannical clutches of villainous antagonists on several occasions. Luffy befriended many civilians from Shells Town, Orange Town, Syrup Village, Cocoyasi Village, Drum Island, Alabasta, Skypiea, Water 7, Fishman Island, and Dressrosa.
Luffy shares a strong relationship with Shanks, the pirate who saved his life twelve years ago in his hometown, and looks up to him as his role model of an ideal pirate. Shanks and his crew are the ones Luffy proclaimed he would beat as they were leaving Luffy's hometown. Luffy will often defend Shanks when others insult him and was relieved to hear from his grandfather that Shanks and his crew were okay. Part of Luffy's dream is to return the hat Shanks gave him when he becomes a great pirate. Shanks, while frequently making fun of him as a child, has remained informed of Luffy's activities and is proud that he has become a pirate. Luffy has since worked diligently on keeping that promise and is infamously known as "Straw Hat Luffy". While discussing taking down the Yonko with Trafalgar Law, Luffy indicated a desire to defeat Shanks as well; echoing his promise to one day form a crew strong enough to defeat the Red Haired Pirates, though he wants to save him for last.
Red Hair PiratesEdit
Twelve years ago Luffy seemed to be friends with the Red Hair Pirates. This extends to two years ago when Benn Beckman stopped Kizaru from attacking Luffy. Lucky Roo seemed fond enough to want to see Luffy again after rescuing him at Marineford to the point he asked Shanks if he wanted to see him after 10 years.
While Coby, the first person Luffy met on his journey, acknowledges that as he is a Marine, they will inevitably have to fight. However, they consider each other friends, as Luffy helped Coby muster the courage necessary to become a Marine. Coby holds great respect for Luffy, and he promises to always be a friend, though his dream - becoming a Marine - is opposite to that of Luffy's. Later on, having met on Water 7, Luffy inspired Coby to pursue his dream of becoming a Marine admiral. Despite having clashed during the war, it appears not to have damaged their friendship, as Coby still admires Luffy's strength.
After entering the Grand Line, Laboon was the first thing the Straw Hat Pirates saw. Launching the cannon in the hopes that it would slow them down, Luffy, instead, hit Laboon. After saving him from Mr. 9 and Miss Wednesday who were trying to use Laboon for food, Crocus explained to Luffy why Laboon would slam his head into the Red Line. Luffy, in an effort to give Laboon a renewed sense of hope, picked a fight with the whale by jamming the Going Merry's mast into the whale's head. After the battle (which Luffy called a draw), Luffy promised Laboon that he would return to see him, under the guise of wanting a rematch, moving Laboon to tears of joy. As a sign of the promise of the future rematch, Luffy paints the Straw Hat Jolly Roger on Laboon's head, commenting that the insignia would be washed away if Laboon hit Reverse Mountain further. This prevents him from slamming against the mountain anymore. The Straw Hats then depart in good spirits for Grand Line.
Luffy is good friends with Nefeltari Vivi, who was with them all throughout the Alabasta Arc, and he even considers her an honorary Straw Hat crew member. Whenever she sees Luffy doing something that might compromise the crew's safety, even when he means to help, she reminds him of a leader's responsibilities, and she holds Luffy in great respect for helping save Alabasta. She was not shocked that Luffy took Nico Robin into his crew despite her being Vivi's enemy in the past (showing trust in his judgment), and she did not show any prejudice about Luffy being the son of the world's worst criminal.
Mr. 2 Bon KureiEdit
Luffy became good friends with Bentham after he apologized for causing them trouble in Alabasta, and distracted the Marines so the Straw Hats could escape. Bon Kurei went as far as to give his life away to save Luffy and other prisoners by posing as Magellan and ordering the opening of the Gates of Justice during the Impel Down Arc. While he was later determined to be alive, Luffy is unaware of his friend's condition.
Skypieans and ShandiaEdit
Defeating the "God" of Skypiea and freeing its people, as well as granting the Shandia back their homeland, ringing the golden bell, and saving Angel Island, Luffy and the rest of the Straw Hat Pirates have become heroes to the people. They even offered the broken column to their saviors. With peace restored to the land many hope that the Straw Hats will visit again. Many were also disappointed that they never got to say good bye and rang the golden bell instead. Aisa seems to hero worship Luffy as a role model, and Gan Fall also compares Luffy to the Pirate King Gol D. Roger.
Luffy also seems to have developed a positive relationship with Trafalgar Law and his crew, as they braved the Whitebeard War and the attacks of the Marine admirals just to save him. Although seeing that they are both Supernovas, and therefore rivals, there may be some ulterior motive behind Law's decision to save Luffy. While on the other hand, Law has been shown to respect Luffy, and could quite simply have come to save him because of that respect. When Luffy met Law on Punk Hazard, Luffy was happy to see him again, not knowing Law's intentions. Luffy stated, with a happy smile on his face, that he and Law will be enemies if he's going after the One Piece too, but he is grateful nonetheless. Luffy was visibly surprised when Robin revealed that Law became one of the Shichibukai during the time-skip. When Law helped save Nami, he proposed an alliance to Luffy to take down one of the Yonko. To the surprise of their crewmates, he accepted after being told that they would be taking down Kaido; saying he intended to take them all down. He appears to trust Law to go along with this plan of action. When Law was shot by Doflamingo, Luffy showed a lot of concern for his ally. After that, when the North Blue pirate was kidnapped by the Shichibukai, Luffy stated his desire to rescue him. Due to Law being his life saviour, Luffy has great gratitude towards Law, considering Law to be his friend. Since the two have formed an alliance, Luffy has developed a running gag of making decisions on behalf of the alliance without considering Law's opinion, usually to the latter's annoyance. He decided to send Caesar Clown flying away in Punk Hazard when the agreed upon plan was capturing him, defeating Donquixote Doflamingo outright when the plan was leaving him for Kaido, and most recently, joining forces with the Mink Tribe and Kozuki clan to take down Kaido. They even have a comical argument about this in Dressrosa, as Law decides to terminate the alliance in light of their plan being compromised. Luffy says Law is his friend and that he can't decide these kinds of things for the both of them, and Law retorts that is precisely what Luffy is doing. Luffy was shocked and later utterly outraged when he thought Law was killed by Doflamingo.
During Law's desperate struggle against Doflamingo, it was shown that Law thinks highly of Luffy and his crew, saying that they are capable of performing miracles. Law later stated that if Luffy was to be defeated by Doflamingo, he would allow himself to be killed as well, since they are in an alliance together. He also said that the fight between Luffy and Doflamingo is his fault, but Robin corrected him, saying that Luffy would not enter a battle with no personal reason.
It also seems like Luffy cannot pronounce "Trafalgar" properly and calls him "Tora-man" (トラ男 Tora-o?) instead, a portmanteau of the "Tra" in "Trafalgar" and the Japanese kanji for "male". It is often localized as "Tra-guy" in some subs or as "Traffie" in Pirate Warriors 3.
Ever since Rayleigh had heard about Luffy from Shanks he had wanted to meet him face to face. When Luffy found him on the Sabaody Archipelago, he was really excited about hearing stories about Gol D. Roger. The more they talked, the more amused Rayleigh felt as he compared Luffy's demeanor to his old captain. He, like Shanks, has very great expectations for him. After the war had ended, he swam across the Calm Belt to reach Amazon Lily where Luffy had been recuperating from his injuries and from losing Ace. From there, he helped Luffy break into Marine Headquarters again with Jinbe in order for him to send the secret message to his crew. Rayleigh also mentored Luffy on how to master all three different forms of Haki that he possessed. After the 2 year timeskip, it is apparent that both of them became close from their training together as before heading to his ship, Luffy yelled towards Rayleigh with a big smile "I'm gonna do it, I'M GOING TO BE PIRATE KING!", with Rayleigh donning a smile with tears in his eyes. Rayleigh himself later proudly proclaimed Luffy as his pupil to the Marines and kept them busy to prevent them from interfering in Luffy's departure. While Luffy set sail Rayleigh seemed to be comparing his late captain Roger and Luffy, claiming that destiny is slowly but surely taking shape and that Luffy has become a man well fit to wear the Straw Hat, which originally belonged to Roger. He also said that it might be worth living a little longer.
He also has a very friendly relationship with the entire population of Amazon Lily despite their initial hostility towards him. But after Luffy gained Boa Hancock's friendship, it seems every single Kuja practically worships him, as they had never seen a man before. They even went as far as selling "touches, pokes and stretching" of Luffy and his rubbery skin for 20 gold pieces each and most of them affectionately refer to him as "Luffy-sama".
Luffy managed to befriend the Gorgon Sisters, despite their previous attempts to kill him for seeing the mark on Shichibukai Boa Hancock's back, which the other two sisters also have. The mark was of the World Noble, proof that they were once a slave to them, and they would have rather died than show the mark to anyone. During a fight with Hancock's sisters, when Boa Sandersonia's mark was about to be revealed, Luffy served in preventing everyone present from viewing it as a form of respect to his opponents, claiming that their secrets have nothing to do with their fight. This sparked up past memories in Hancock, and she then revoked her decision to eliminate him. Upon further testing his selflessness, she reveals their past to him, and Luffy forgives them, showing that he only hates the Celestial Dragon who did all of them wrong, earning their friendship and Hancock's love. He has come to greatly appreciate Hancock in return, as she helped him in the two major instances of helping him break into Impel Down and giving him the key to Ace's seastone handcuffs. However, while Luffy does not have the same romantic feelings towards Hancock that she feels towards him, he has shown that he genuinely cares for and appreciates her. During his fight with Magellan, when the warden stated that he would have Luffy tell him how he managed to break into Impel Down, Luffy protected Hancock by declaring he would not tell Magellan even if it killed him. He later showed his gratitude by hugging her and remarking afterward that she had "saved his ass" twice, both in helping him break into Impel Down and giving him the key to Ace's seastone handcuffs. After the two-year timeskip, Hancock mentioned that she's a thoughtful woman suitable to be a great wife for loading the ship with Luffy's favorite foods. Luffy replied that he was grateful to her for bringing food for him, but he wasn't going to marry her. Regardless, Luffy replied that he wishes to see her again sometime in the future.
While initially assisting Luffy only to protect and rescue Ace, the ex-Shichibukai Jinbe grew so fond of Luffy that he proclaimed while fighting Akainu at Marineford that he would gladly lay down his life to protect Luffy. After escaping the ordeal, he stayed with Luffy on Amazon Lily while he was recovering. It was Jinbe who also brought Luffy out of his self-pity and doubt. The fishman made Luffy realize that even though Ace had died, he still had his own pirate crew. As Jinbe departed from the Kuja ship, he and Luffy expressed the desire to see each other again in two years. Luffy tells Keimi of this desire, only to be disappointed when he finds out that Jinbe had to leave Fishman Island. However, before he left, Jinbe did leave a message for Luffy with Prince Fukaboshi.
When they met after two years, Jinbe was happy to see him again but surprised he had not received his message. As he himself stated, he has the deepest gratitude for Luffy and his crew for stopping Arlong. He also wanted to apologize to them for Arlong, since he was the one who let Arlong go to the East Blue. Despite the mutual respect between them, after Luffy announced his desire to fight against Hody Jones to save his crew, he informed Jinbe that if he wanted to stop him, he would have to fight him. They eventually reached a compromise and formed a united front to combat Hody Jones and his crew. After the battle of Fishman Island, in which Luffy lost a large amount of blood, Jinbe offered his blood for the transfusion. Upon recovering, Luffy asked Jinbe to join his crew. While happy to have been asked, Jinbe declined the offer, stating he has other business to take care of first, but said when all that was done and they meet again, if Luffy and his crew still wanted him to join later, he promised he would join then. Luffy and all the crew members show they want him to join.
During the Whole Cake Island Arc, while Luffy and Nami were being held prisoner by Charlotte Opera, Jinbe came to their rescue by attacking the captor as Luffy was very excited to see his friend who stated his intention of freeing them. It is shown that Luffy trusts Jinbe's opinion, as he fully agreed to meet with Capone Bege (even after hearing the horrible actions Bege did in the past). Jinbe also broke up an argument between Luffy, Bege, and Caesar by pointing out that they share a common enemy in Big Mom.
Luffy has on numerous occasions been aided or befriended by members of the Revolutionary Army due to being Dragon's son. In Impel Down, he befriended Emporio Ivankov and Inazuma. Before directly encountering him, however, Ivankov and all of his Okama followers were already aware of Luffy's status as not only a pirate but Impel Down's first-ever intruder through the Den Den Mushi surveillance systems within the Great Gaol, and he unintentionally achieved a celebrity status within New Kama Land as a result. Ivankov helped save Luffy's life with his healing hormones because he was moved by Luffy's selflessness, as Luffy begged that Bentham be saved even while being on the verge of death himself. Once they learned of his connection with Dragon, Ivankov determined himself to ally himself with Luffy, and protect the young pirate's life as best he could. Ivankov and Inazuma both aided Luffy in the breakout of Impel Down and assisted him in rescuing Ace at the Battle of Marineford. Upon the war's end, they snuck aboard the Marine ship that Boa Hancock took over. Ivankov then left Luffy in Jinbe's hands and then left with his Newkama followers to return to Momoiro Island as well as saying that he would like to meet Luffy again.
He gained the assistance and admiration of all of the Whitebeard Pirates and allies, even Whitebeard himself, in his quest to save Ace. They followed Whitebeard's orders to back up Luffy after witnessing him unleash his Haki. After the death of Ace, the whole Whitebeard Pirates crew protected Luffy, as if he were Ace, claiming that he is all that is left of Ace's spirit. After the time-skip, Luffy expressed shocked at hearing they fought and lost to Blackbeard as he was eager to see them again and thank them for protecting him from Akainu.
Some time after their arrival, the Straw Hat Pirates became criminals of Fishman Island except for a few friends due to suspicion of kidnapping mermaids, Madam Shyarly's prophecy of Luffy destroying Fishman Island, and then Luffy's crew taking over Ryugu Palace when the Neptune Army attacked them. However, things changed after Hody Jones launched his coup d'état and was on the verge of executing Neptune. Rather than watching their king die, the civilians were willing to see Shyarly's prediction come true. During the ordeal, the Straw Hats were able to gain the civilians' trust after Luffy thwarted Neptune's execution per Shirahoshi's pleas and when the crew was seen fighting alongside Jinbe. After saving Fishman Island from the New Fishman Pirates, Vander Decken IX, and Noah, Luffy and his crew were cleared of the kidnapping charges when the mermaids were found and the Straw Hats were hailed as heroes for their efforts in saving the island from destruction. However, when Luffy was suffering from critical blood loss, the civilians did not do anything to help him due to their laws, but they rejoiced when Jinbe volunteered to be the blood donor. After a huge party in the Straw Hats' favor, Luffy discovered that while Fishman Island was protected by Big Mom, she would not hesitate to destroy Fishman Island if she did not receive her monthly 10 tons of candy. Luffy then took responsibility for the missing candy to protect Fishman Island again. When negotiations of treasure instead of candy failed, Luffy declared that he would defeat her in the New World and claim Fishman Island as his territory.
Fukaboshi did not show resentment towards to Luffy or his crew when they arrived (even though it was illegally). In fact, he only wanted to find him in order to deliver a message from Jinbe. When Luffy was accused of kidnapping mermaids and prophesised to destroy Fishman Island by Madame Shirley, he begun to raise doubts of both accusations. Finally, when he discovered that Hody Jones hated humans simply because he was raised to, he begged Luffy to, "set everything to zero." Luffy obliged on his request, saying that they are friends of course.
Luffy formed a friendly relationship with Princess Shirahoshi after saving her from an axe thrown by Vander Decken IX and after she learned that he saved her beloved pet shark, Megalo. Once Luffy learned that Shirahoshi had been locked in Hard-Shell Tower for ten years to keep her safe from Decken, he stated that it must have been really boring for her. Luffy then offers to take a walk with her outside the castle with him serving as her bodyguard so she could see the world outside her tower while protecting her from Vander Decken IX. Even though Luffy and Shirahoshi do get along, Luffy gets annoyed at her tendency to cry. After seeing how fragile Shirahoshi's personality is, Luffy bluntly called her a crybaby and a weakling. This seems to parallel how Ace and Luffy's relationship were as children. Shirahoshi, however, does not show any resentment towards Luffy for calling her names. After seeing how Shirahoshi was able to honor her mother's final wish for so many years, Luffy acknowledges that she is not as weak as he originally thought. He then calls her "Weakhoshi" since he still considers her a crybaby. After the island was saved and Luffy was about to leave, he promised to take her to the surface to see a real forest the next time they met. Due to the promise, she refused to attend the Reverie with her family, showing a strong devotion and friendship with Luffy. Luffy is unaware of Shirahoshi's true identity of Poseidon.
Initially enemies due to Luffy and his crew opposing his "master", Brownbeard did not trust them and resented them for capturing him. However, Luffy seemed to respect Brownbeard's admiration for Caesar. When Luffy discovered that Caesar betrayed Brownbeard, his hatred for the scientist grew and he resolved to save Brownbeard from being killed by his own followers under Caesar's command. When the conflict was resolved, Luffy thought it was a shame when Brownbeard decided to turn himself in, even calling the former pirate his friend.
Luffy met Bellamy back on Jaya and, after the latter mocked Luffy for chasing his dreams and believing in things like One Piece and Sky Island, Luffy chose not to fight back and let Bellamy and his crew beat on him, mirroring what Shanks did to Higuma. However, after Bellamy assaulted Cricket and stole his treasures, Luffy returned to fight him. As Bellamy continued to ridicule him on his dreams, Luffy returned the favor from earlier and brutally pounded Bellamy in the ground with one punch.
Two years later, Luffy was shocked to see him again and surprised that Bellamy no longer holds any ill towards him and will not laugh at him. During his fight in Block B Luffy even cheered for him and they later had a friendly talk. Bellamy was even reluctant to assassinate Luffy per Doflamingo's orders. During the Bird cage game, Luffy declared Bellamy a friend after seeing him so horribly beaten by Doflamingo after all the admiration the latter had for him. After Doflamingo released Bellamy from his control, Bellamy refused to betray his own principles and asked Luffy to fight him one last time. Though Luffy tried to talk him out of it, he reluctantly punched Bellamy in the ground in a similar manner at Jaya. With his last thoughts, Bellamy thanked Luffy for calling him a friend. After Doflamingo was defeated, Bellamy parted ways with the Straw Hats and while stating he will not be Luffy's subordinate like those who join the Straw Hat Grand Fleet, he would keep a piece of the Vivre Card just in case he got into trouble.
Luffy has been on good terms with Rebecca after she shared the story of Kyros with him when he took an interest in his statue. Rebecca was thankful for Luffy defeating Spartan and was impressed with his performance during the Block C battle royale. Even though she tried to kill Luffy to better her chances of getting the Mera Mera no Mi in order to protect the one she cares about, Luffy did not hold a grudge against her and was still thankful for her buying him food. Afterwards, Rebecca opened up to him. In turn, Luffy considers her a nice person and was angry at the audience for throwing horrific insults at her due to her lineage. When Doflamingo unleashed the Birdcage to conceal Dressrosa, she became a target to his game, which caused Luffy to worry about her. Luffy promised Rebecca that he would repay her by defeating Doflamingo and when she asked Luffy if he can defeat Doflamingo, he proclaims he can since he's going to become King of the Pirates. After defeating Doflamingo, she cried in tears when Luffy won and was by his side when he became unconscious after the battle. Even after finding out his real name, Rebecca still calls him by his gladiator name "Lucy". Luffy cares for Rebecca and understood her feelings, he was not happy with Kyros's decision to stay away from her, so Luffy ran to the palace in spite of being chased by the Marines asking her if she is ok with her father's decision. After Rebecca replied she is not, Luffy took her close to where Kyros is. This seems to parallel how Luffy felt when he was a boy where he and Ace were forced to stay away from Sabo and couldn't bring him back due to their social class. As Rebecca sees Luffy and the others leaving, Rebecca hopes that one day she'll see him again.
Because Monkey D. Garp crushed his pointy head and robbed him of the means to acquire a certain treasure, Chinjao developed a hatred not only against Garp but also those in his bloodline. At the Corrida Colosseum, Chinjao originally tried to take his grudge out on Luffy. Ironically, when Luffy defeated him, he inadvertently returned what Garp took away by restoring his pointy head, gaining his gratitude. Afterwards, Chinjao's grudge against Luffy and his family was lifted and he later joined forces with Luffy to defeat the Donquixote Pirates.
Because Luffy (while as Lucy) was gaining such attention in the Colosseum with his amazing feats, the commentator Gatz became a huge fan of Luffy rooting for him to win the competition. During the fight against Doflamingo, Gatz came to Luffy's side when his Gear Forth wore off and protected him from Doflamingo's rampage long enough with various gladiators to give Luffy enough time to regain his Haki. Furthermore, he has a lot of faith in Luffy to the point he made a broadcast to the whole island that Luffy would defeat Doflamingo with one punch and save the kingdom. After Doflamingo's defeat Gatz tearfully proclaims Luffy to be the victor of both the fight and the savior of Dressrosa. When he learns that Luffy supposedly kidnapped Rebecca, he was left in shock but still remained a fan of his. But it was clear that he was aware that Kyros is Rebecca's father and was happy that Luffy brought her back to him. Even after finding out his real name, Gatz, along with the citizens of Dressrosa, still calls him by his gladiator name "Lucy".
The minks are grateful to Luffy and the the Straw Hats, not only because Sanji's group saved them after being devastated by Jack's attack on Zou, but also because Luffy's victory over Doflamingo and the latter's following arrest was what caused Jack to abandon his campaign and leave the island. After seeing how the Mink Tribe risked their lives and protected the samurais from Jack, he became amazed. Luffy then formed an alliance with them in order to defeat Kaido, along with the Kouzuki Clan and the Heart Pirates.
Luffy met the clan when he and the crew were on Punk Hazard after receiving a distress signal. After rescuing Kin'emon and Momonosuke, guardian and master, from the island and Caesar Clown, Luffy allowed them to travel with him and his crew to search for their other comrades. After the battle with Doflamingo ended in victory and the rescue of their comrade Kanjuro, they continued to travel to Zou. Once on Zou and learning about Momonosuke's true heritage, he doesn't care in the slightest. After meeting their last comrade Raizo, he wanted to see him do tricks and became amazed when he did them. After learning about what Kaido has done to their country, Luffy was willing to form an alliance with them in order to defeat Kaido, along with the Mink Tribe and the Heart Pirates. Luffy and Momonosuke seem to get into small fights like two brothers. This seems to parellel how Luffy and Ace used to fight and argue when they were kids.
Luffy first met Vinsmoke Reiju, Sanji's elder sister, when the Sanji retrieval team encountered Germa 66 just after entering Big Mom's territory. During that first meeting, Reiju noticed immediately that Luffy was slowly dying from the effects of consuming the Armored Stonefish's poisonous skin. Unlike her younger brother Yonji, Reiju chose to save Luffy's life, sucking the poison out of his body as her thanks for everything the Straw Hats had done for Sanji. They later met again inside Whole Cake Chateau, after Reiju helped hide Luffy from Big Mom's guards. She informed Luffy that Sanji already knew of Pudding's plan to kill him during the wedding ceremony, leading a relieved Luffy to thank Reiju before (much to her shock) jumping out a window.
During their brief encounters, Reiju has been shown silently admiring Luffy's loyalty to her younger brother. After she saved his life, Luffy thanked Reiju but immediately demanded that she return Sanji, causing her to smile. She also smiled after seeing Luffy and Nami on Whole Cake Island, having successfully made it that far in order to rescue Sanji, and was visibly saddened after witnessing Sanji being forced to attack Luffy in order to keep Luffy from following them. She also offered Luffy food after hearing his stomach grumbling, and smiled when he turned her offer down because of his promise to only ever eat Sanji's food again.
In a private conversation between herself and Sanji, Reiju described the Straw Hats as his wonderful friends. Against the plans of their family, she urged Sanji to flee Whole Cake Island with them, warning him that he would never again meet such friends in his life. Sanji refused to leave her to die, however, and after he reunited with Luffy, he told Luffy of his desire to save the rest of his family. Luffy agreed to help, citing in part the fact that Reiju had previously saved his life.
Unlike with the rest of the Big Mom Pirates, Luffy's relationship with Pekoms in particular is much more positive, with Luffy showing concern for Pekoms well being after Jack's second attack on Zou. Pekoms, in return, guided the Sanji retrieval team to Totto Land and covered for them from being detected on first arrival. Luffy was also angered when he learned that Capone Bege abducted and attempted to kill Pekoms. Luffy called Pekoms a friend and wanted to punch Bege for shooting the latter when they were negotiating.
East Blue PiratesEdit
Luffy has made enemies out of many pirates during his journey to become the Pirate King. Before entering the Grand Line, the first pirate enemies that he met in East Blue include Alvida, Buggy, Kuro, Don Krieg, and Arlong. Luffy freed Alvida's cabin boy, Coby, and became the first man to ever hit her. Buggy mocked Luffy's dreams and became the first person in the series to damage Luffy's Straw Hat. Luffy also interfered with the schemes of Kuro, Don Krieg, and Arlong and ended up derailing their ambitions.
Grand Line PiratesEdit
Luffy has passed several islands along the Grand Line, including Drum Island, Little Garden, Alabasta, Skypiea and Long Ring Long Land. He has met enemies even more formidable than the foes he encountered in East Blue. Starting from Whiskey Peak, Luffy and his crew became targets of Crocodile and his organization, Baroque Works. Wapol first met the Straw Hats on their way to Drum Island and antagonized them by eating a bit of their ship. When Luffy met Wapol again on Drum Island, Luffy sent Wapol flying, keeping him out of Drum Island for good. When the Straw Hats finally reached Alabasta, the crew struggled to foil Crocodile's scheme for the sake of their friend, Princess Vivi. In Long Ring Long Land, he faces Foxy the Silver Fox and his crew.
While Luffy has amass a large and diverse network of friends and allies, he has also made enemies and rivals out of some of the greatest figures and organizations of the sea as well over the progression of his voyage for various reasons, the three most prominent examples being they somehow hurt those he see as friends, they desire the title "King of the Pirates" or more recently due to his revealed heritage.
Hody Jones and Vander Decken IXEdit
After the Straw Hats arrive at Fishman Island, they became enemies of Hody Jones and the New Fishman Pirates for crushing Arlong's ambitions. Luffy has gained a deep hatred towards Hody's treatment towards his men and the people of Fishman Island for trying to destroy everyone. To that end, Luffy defeated him and stopped his takeover. Even after his defeat, Hody demanded a rematch with Luffy despite corroding his body beyond repair. Luffy also antagonized the captain of the Flying Pirates, Vander Decken IX, for standing between him and the object of his desires, Princess Shirahoshi.
Luffy and his crew become Caesar's enemies after they stumbled on Punk Hazard. To ensure that word of his felonies does not become public, he ordered his underlings to eliminate the Straw Hat Pirates. Once the crew learns of the sinister experiments that Caesar has been conducting, they aim to capture him. Luffy did originally think of him as a nice person from what Brownbeard stated, however, after hearing from Momonosuke about his cruel treatment towards his men and how he does not care about what happened to the children, Luffy became enraged and more determined to defeat him. Caesar warned him that if he defeats him, Doflamingo and one of the Yonko will come after him by touching him, though Luffy retorts with an angry punch stating he has been taking on guys like that since he entered the Grand Line.
On Zou, Luffy completely forgot about Caesar and was only reminded of his actions when it was said that Jack used one of Caesar's gas weapons to poison the Mink Tribe. At Whole Cake Island, he spotted Caesar among Bege's crew and was angry to see his face again as the latter tried to deny his identity. However, after it was pointed out that it was really him, the two got into an argument with Caesar blaming Luffy for all the pain and suffering he has been put through. They nearly came to blows only to stop when Jinbe pointed out that they share a common enemy in Big Mom and were forced to briefly put aside their differences.
Doflamingo's Business AssociatesEdit
Due to Doflamingo being defeated by Luffy, everyone who he was having business transactions with suffered. As a result, many of the pirates developed a grudge against Luffy, with one even stabbing his wanted poster with a dagger. An alliance of these pirates was formed with intentions of getting revenge on Luffy by attacking him and his allies as they were about to leave Dressrosa, however, they were stopped by Fujitora.
Charlotte Family and Big Mom PiratesEdit
Luffy has already invoked the hostility of the Big Mom Pirates during his argument with Pekoms and Tamago regarding the candy tribute on Fishman Island. Later, he became a major enemy of Big Mom's family and crew after he arrived at Whole Cake Island and they served as obstacles to Luffy's efforts in rescuing Sanji.
After Luffy defeated Charlotte Cracker, the Charlotte Family and Big Mom Pirates formed an army to avenge Cracker's defeat, ultimately wearing him down with attrition.
When the Sanji Retrieval Team first encountered Charlotte Pudding, she appeared willing to help free Sanji from his "arranged wedding". However, when she was visiting Luffy and Nami in their prison cell, she then reveals her sinister nature as Pudding whispered her plan to kill Sanji during their wedding day, which shocked and angered Luffy.
Luffy's personality has left an imprint on Eustass Kid, being left with respect for him after he boasted that he would be the one to find One Piece. They departed on good terms and agreed to meet up again in the New World. After the Whitebeard War, Kid stated that he is not generous enough to let Luffy run around as he pleases.
Though she and Luffy have yet to actually meet face-to-face, Luffy's actions during the Celestial Dragon incident have unintentionally garnered him Bonney's fury, a fury that even extended to the rest of the Straw Hats. Upon hearing of Luffy's attack on a Celestial Dragon, Bonney was angered and swore to crush the Straw Hats in the New World. However, after the time-skip, when learning of Doflamingo's defeat, Bonney was happy for Luffy's victory and stated that she was proud to be in the same generation with Luffy.
After Luffy punched a World Noble, Capone Bege was angered at him for causing trouble at Sabaody Archipelago. He later antagonized his crew by capturing his cook, Sanji, and forcing him to attend the wedding with Big Mom's 35th daughter, Charlotte Pudding. Later when Jinbe talked about Bege's past, Luffy was appalled by his cruelty, and was further angered towards him after learning that he abducted and attempted to kill Pekoms. However, Luffy agreed to meet with his fellow Supernova to discuss terms for a possible alliance in order to take down Big Mom. At the negotiations, the two had a heated argument with Luffy wanting to attack Bege for hurting Pekoms but they were forced to put aside their differences after Jinbe pointed out that they share a common enemy in Big Mom. After listening to the assassination plot, Luffy agreed to being the bait in Bege's plan due to finding it interesting.
Even the Marines started to take him more seriously after he defeated the villainous Marine Captain "Axe-Hand" Morgan and several known pirates such as Buggy the Clown, "Pirate Admiral" Don Krieg, and Arlong the fishman. A 30,000,000 bounty was placed on his head after he had beaten Arlong and the Marines were cautious about Arlong's defeat because it had brought to question the worth of their units. This reward eventually becomes 100,000,000 after he defeated Crocodile, when the World Government deemed him a serious threat for defeating one of the Shichibukai. After the invasion of Enies Lobby, where they declare war on the World Government itself, the government raised the bounties of the entire crew; Luffy's was raised to 300,000,000, to 400,000,000 after the Whitebeard War and to 500,000,000 after defeating Doflamingo.
During his voyage, Luffy has had a few meetings with the Marines, from the not too serious looking return of Ironfist Fullbody (whom Luffy met first by the Baratie) and Captain Smoker of Loguetown, to Admiral Aokiji. While some are easy to defeat, Luffy has been unable to defeat Smoker or Aokiji due to their powerful Logia abilities, and has resorted to running away from Smoker when he encounters him (until he mastered haki).
Luffy has a great rivalry with Smoker since the two met in Loguetown. After Smoker watching Luffy show no fear when Buggy attempted to kill him, he recognized Luffy as a potential threat and was determined to capture him at any price only for Dragon (Luffy's father) to stop him.
Even though they are enemies, Luffy admitted that he likes him and sees him as a good guy. In Alabasta, Luffy asked Zoro to save Smoker from drowning, showing some compassion for the Marine.
During the war at Marineford, Smoker initiated another confrontation with him and easily overwhelmed Luffy until Hancock intervened. When they met again in Punk Hazard, Luffy was happy to see Smoker alive, and stated that he was worried about him after the battle at Marineford. Both Luffy and Smoker were forced to put aside their rivalry to join forces and face Caesar Clown and Vergo. After rescuing the children that were held captive by Caesar, Smoker once again allowed Luffy, his crew, and his allies to go free.
While Sakazuki was an Admiral, he caused the most damage to Luffy during the war at Marineford, sending him into a mental breakdown by successfully killing his brother, Ace. Akainu then proceeded to hunt him throughout the entire battlefield, swearing to end his life no matter what, despite Blackbeard attempting to bring down Marineford. True to his word, Akainu focused all his efforts on ending Luffy's life, which reached the point of dangerous obsession, as it took the combined efforts of Jinbe, Crocodile, and the Whitebeard Pirates just to protect Luffy from Akainu's relentless pursuit. Akainu ultimately failed to kill Luffy after the intervention of Coby and the arrival of Shanks. Nonetheless, after striking through Jinbe, Akainu managed to leave Luffy with an x-shaped scar on his chest, which seems to remind him of the ruthless Marine officer, evidenced when Luffy touched the scar in anger upon learning of Akainu's promotion to Fleet Admiral.
For killing his brother, Ace, in the war at Marineford, Luffy holds hatred for Fleet Admiral Sakazuki. To this day, Akainu is the only enemy in the series who succeeded in completely breaking Luffy's spirit.
Luffy first met Admiral Aokiji at Long Ring Long Land. Luffy was hostile as he tried to attack Aokiji on the believe that the Admiral would try to take Robin away. Later on, Luffy warmed up to him after the Admiral helped Tonjit. However, he was a little shocked to learn that Aokiji knew his grandfather. Luffy's hostility towards the Admiral returned when Aokiji changed his mind about not taking Robin into custody. Luffy engaged Aokiji in a one-on-one fight which ended with Aokiji emerging as the victor. Aokiji spared Luffy due to owing the latter for defeating Crocodile, but also because he was indebted to his grandfather, Garp. Due to bearing witness to Aokiji's power, Luffy decided to act less naive against future conflicts.
The two met again at the Battle of Marineford, where Aokiji attacked Luffy, stating that while he was indebted to Luffy's grandfather, the latter had chosen his path of death. Before Aokiji could finish off Luffy, Marco got in the way, allowing Luffy to advance. Aokiji was very shocked to see Luffy unconsciously release a burst Haoshoku Haki, nearly sweating at the sight. Near the end of the war, Kuzan tried to prevent Luffy from escaping when he froze the sea before Jinbe (who was carrying Luffy) could reach it and when he attempted to freeze Law's submarine when the Heart Pirates were taking Luffy away.
Two years later, Luffy was very shocked to hear from Jinbe that Kuzan was no longer a Marine and that he fought and lost against Akainu for the position of Fleet Admiral.
Due to Luffy assaulted a Celestial Dragon, Kizaru was sent to Sabaody Archipelago to arrest him. However, he escaped from Sabaody due to Kuma's interference. During the Battle of Marineford, Kizaru was a major hindrance to Luffy's attempts to rescue Ace. He kept Luffy from his goal multiple times and even destroyed the original key to Ace's handcuffs. Kizaru also mocked Luffy for lacking in power to save Ace. Despite that, Kizaru was very surprised to see Luffy unconsciously release a burst of Haoshoku Haki and joined his fellow admirals in trying to eliminate Luffy.
Before resigning from the Marines, Sengoku was angry with Luffy's actions such as defeating Shichibukai Crocodile, invading Enies Lobby and defeating Rob Lucci of the CP9, and defeating the then Shichibukai Gekko Moriah. After hearing that Luffy punched the World Noble, Saint Charloss, he was enraged, wondering what was wrong with Garp's family.
His frustration reached its breaking point after hearing that Luffy made into and out of Impel Down and intruding on the war against Whitebeard in an attempt to rescue Ace. During the war, Sengoku revealed to the world that Luffy was just as dangerous as Ace, because he is the son of Revolutionary Dragon. He was very shocked to see Luffy unconsciously use Haoshoku Haki but attempted to execute both him and Ace when Luffy managed to reach Ace with a key to his chains.
Luffy first encountered Issho at a casino in Dressrosa and he helped the man by informing him that he was being scammed by members of the Donquixote Pirates. He was amazed to see Issho effortlessly defeat the thugs and when asking for his identity, the latter told him it was best he if did not know for both of their sakes. Later on, when Doflamingo was fighting Law at Corrida Colosseum, Luffy was surprised to learn that Issho was a Marine admiral while the latter sadly stated he was repaying Luffy's good deed with violence due to having to capture Law.
When Luffy was preparing to leave Dressrosa, Issho planned to arrest Luffy and his allies. Luffy challenged the Admiral to a fight, proclaiming that he will not run from anyone regardless if they are an Admiral or Yonko before striking him. Though Luffy challenged the Admiral to a fight, he announced his attacks, making the man see that Luffy was pitying him due to his blindness which he took as an insult, revealing that he blinded himself and does not need Luffy's pity. Their fight was left at a stalemate when Luffy was forced to retreat by his allies. While Luffy was retreating, he was "pursued" by the citizens of Dressrosa and Issho overheard some of them speaking happily of Luffy. This made him relent as he saw there were people touched by the actions of a pirate and made him regret blinding himself as he wanted to see Luffy's face so he could see the pirate who obtained such praise. He later used the rubble he gathered to attack the group of pirates who were angry at Luffy for beating Doflamingo, which was done as thanks for Luffy defeating the former Shichibukai.
Naturally as a pirate, Luffy is an enemy of the World Government, though he wasn't important to them at first, they started taking him seriously after he surpassed every pirate in the East Blue, and even more after defeating Crocodile at Alabasta, declaring war on them by burning their flag and defeating Rob Lucci CP9 at Enies Lobby,defeating Gekko Moriah at Thriller Bark, striking a World Noble and surviving after that Saboady Archipelago, and now they see him as a potential threat to the whole world when he is revealed to be the son of the Revolutionary Dragon, and that he survived the Whitebeard War.
Despite never encountering each other, Luffy has made enemies out of the Gorosei, which they consider Luffy both a trouble maker and a potential threat to the government after his victory over Crocodile and later on punching a World Noble. Because of Luffy's actions, the Gorosei view Luffy as a potential threat to the balance of the Great Three Powers, especially after learning of his relationship to Dragon. After Doflamingo's defeat, the Gorosei are shocked and angry that Luffy did another incident causing the Gorosei calling him a "Brat".
Luffy has also made enemies of the World Nobles after punching Saint Charloss for shooting his friend, Hatchan. Luffy even stated that he hates the World Nobles while Hancock explained her past as a slave. During the Whitebeard War, Kizaru stated that the nobles have been clamouring for his arrest. Luffy's detestment to the World Nobles was added to his despisment for Doflamingo after the latter revealed he used to be one.
Luffy also made a very dangerous enemy out of Magellan during his break-in at Impel Down. The fact that Luffy was the first to break into Impel Down was enough to infuriate Magellan. The chief warden severely poisoned Luffy during their first battle causing Luffy to lose ten years of his life span in a painful healing process. After realizing that Luffy survived his poison and had released more prisoners, Magellan did everything in his power to ensure that Luffy did not leave Impel Down alive. Even though Luffy did not manage to defeat Magellan in battle, he did successfully tarnish his reputation by escaping his grasp.
Luffy and his crew are major enemies of the CP9 agents for declaring war on the World Government and for them trying to kill Robin. Luffy originally thought of the agents he met at Water 7 to be good people, but once he saw them trying to frame them for killing Iceburg, destroying Galley-La Headquarters and forcing Robin to accompany them, Luffy became enraged by their actions and became enemies.
Luffy viewed the agent Blueno an annoyance for standing in his way from getting to where Robin was, but thanked him for a good fight and helping him uncover his Gear Second.
Spandam originally viewed Luffy as a weak pirate, but after his assault on CP9 and his crew winning and saving Robin, Spandam has developed a grudge against them.
Luffy's biggest enemy of CP9 is Rob Lucci. With Lucci, Luffy holds a deep hatred for trying to kill him and his crew and all of Galley-La despite knowing them for years. Lucci even personally attempted to make sure Luffy's crew would not survive Enies Lobby by flooding the underground passage from where they all in hopes of Luffy losing everything for his own enjoyment. Lucci continuously mocked Luffy, stating he's too weak to defeat Enies Lobby and save Robin. However, Lucci is one of the strongest opponents Luffy has ever faced and forced the Straw Hat captain to push himself beyond his limits to defeat him. Regardless, Luffy stated he is glad to have met them, due to him having become stronger from fighting them.
Though antagonistic towards one another earlier in the East Blue, Luffy's relationship with Buggy is overall similar to that of Buggy's relationship with Shanks: a friendly yet slightly antagonistic way. Though Buggy was a formidable opponent for Luffy when they met, now Buggy is nothing more than an annoyance to the Straw Hat captain, having barely noticed Buggy when he met him again in Impel Down. Buggy on his part tends to attempt to take advantage of Luffy's naivety for his own personal gain (though whenever Luffy responds with his usually kindness results in Buggy being very guilty). After learning who Luffy's father was, Buggy was deeply shocked realizing further why Luffy is such a trouble maker.
Despite his fearsome reputation, Luffy let Zoro face the Shichibukai and, after seeing Dracule Mihawk nearly kill Zoro, Luffy flung into rage but later was pleased seeing Mihawk let him live to surpass him. When Mihawk asked Luffy his dream, the latter stated it was to be Pirate King a goal which Mihawk stated would be harder than surpassing him something Luffy shrugged off. It appears Mihawk likes to keep tabs on Luffy and his crew due to the vast potential they posses. During the Whitebeard War, Mihawk was amused at Luffy's entrance in the battle and unfazed after finding out who the latter's father was. He also purposely fought Luffy to test him if he's worthy of the next age, even though he maintains the upper-hand, he compliments Luffy by stating he wasn't as reckless as he thought. In Mihawk's opinion, he views Luffy as a potential threat for the future due to his unique ability to make allies out of everyone he meets, even former enemies.
Bartholomew Kuma similarly came to the rescue of the Straw Hats on numerous occasions. In their first meeting, Kuma allowed Luffy's crew to escape from Thriller Bark, despite being ordered to kill them. This was likely due to his conviction as an officer of the Revolutionary Army. While it is not known what his intentions were in engaging the crew in battle, and forcing Zoro through an incredible test of endurance, it is likely that he meant to test their dedication to Dragon's son, and expose them to the terrifying power of forces in the seas ahead. In their second meeting, Kuma directly interfered with an assault by the Marines to save the crew with his teleportation powers. Finally, as his last act of free will, he had Dr. Vegapunk program him to protect the Thousand Sunny until its crew returned. The incredible lengths Kuma took to aid them has made him a savior of the crew. When also considering the army's care for Robin during the two years of separate training, it is likely that the Revolutionaries will prove to be powerful and dedicated allies in the future, despite Dragon's choice to have almost no direct contact with his son. However, Franky stated that while they owe a great debt to him, the next time they meet he will have become nothing more than a mindless killing machine for the government.
After seeing Crocodile and his Operation Utopia plan to destroy Vivi's kingdom, Luffy grew furious at the Shichibukai, swearing to defeat him. However, Crocodile viewed Luffy as just another rookie who knows nothing of the world. During their third fight, Crocodile stated once Luffy learns what the seas are truly like, he would forsake his dream. In the Impel Down Arc, Luffy was enraged to see Crocodile and refused to accept his help and only allowed the latter to join when Emporio Ivankov promised to keep an eye on him. When they arrived at Marineford, Luffy knew Crocodile would try to attack Whitebeard and prevented the latter from doing so, much to Crocodile's chagrin. Though Crocodile claimed to align himself with no one during the Battle of Marineford, he saved Luffy's brother, Ace, and later Luffy from the then Admiral Sakazuki. However, Crocodile's reason for protecting Luffy was to prevent the Marines from having their way.
Luffy is a major enemy of Gekko Moriah for trying to take his and his crew's and others shadows. That feeling is mutual, and they also seem to see each other as rivals, as they both aim to become the Pirate King. Like Crocodile, Moria viewed Luffy as an inexperienced rookie stating the he's no where near ready for the New World and would only lose everything due to his overconfidence. True enough, Luffy and his crew were utterly powerless to Kuma and were scattered across the world and trained for the next 2 years to grow ready for the New World. At the Battle of Marineford, Moriah was very displeased to see Luffy again and attempted to steal his shadow once more only to be repelled by Jinbe. Moriah was also the only Shichibukai to be shocked upon hearing that Revolutionary Dragon was Luffy's father.
Doflamingo originally thought little of Luffy, however, he did advise Caesar, Vergo and Monet to be vigilant of him and his potential. Furthermore, after discovering Doflamingo used Ace's fruit to lure Luffy to the Corrida Colosseum, Luffy refused to let anyone else claim it. He later became furious with Doflamingo for trying to kill Law and his cruel treatment towards the people of Dressrosa and promised Rebecca he would defeat him. His anger became both shock and fury after hearing Doflamingo reveal his past as a World Noble and stared angrily as the latter bragged how he murdered his father without remorse. His rage increased after being forced to defeat his former enemy Bellamy due to admiration of Doflamingo despite how he treated him. This fury further increased upon seeing Law unconscious and missing an arm thanks to his battle with Doflamingo. Luffy often refers to Doflamingo as "Mingo".
Robin stated that the Pirate Alliance between the Straw Hat Pirates and the Heart Pirates would not be the sole reason he was fighting Doflamingo. This idea was supported when Doflamingo stated Luffy was in the way of his plans causing Luffy to retort he was in the way as he wasn't defeated with that Luffy activated his Gear Fourth, saying that Doflamingo's evil deeds are the reason of his fight with the Shichibukai. Once entering Gear Fourth, Luffy turned the tables on Doflamingo as he overwhelmed the latter before his Haki wore off. Luffy was forced to hide as Doflamingo angrily searched the island determined to make the Straw Hat Captain pay for his actions.
When Luffy regained his haki and confronted Doflamingo once more, it is here where Luffy reached a breaking point as upon hearing Doflamingo stating that if everyone on Dressrossa had stayed manipulated, no one would have to die. While admonishing Doflamingo, Luffy swore to beat the shichibukai and leave Dressrosa before using King Kong Gun against the latter and putting all his strength in the attack. Luffy defeated Doflamingo, thus putting an end to his tyrannical reign.
During the war at Marineford, even Whitebeard himself came to respect and admire Luffy, so much so that he refered to Luffy as "Straw Hat Luffy" whilst he refered to others as "Brat". After seeing the lengths to which Luffy would go to save Ace, Whitebeard even remarked that he would not forgive Marco if he let Luffy die. Soon after, he assigned his crew and allies to back up Luffy after witnessing him unleash his Haki.
Marshall D. TeachEdit
When Luffy first met Marshall D. Teach in the Wild Cherry on Jaya Island, they were rivals over some petty things like favorite foods. After Luffy got mocked by Bellamy for being a dreamer, Blackbeard gave the Straw Hat captain a friendly speech telling him not to give up on his dreams, despite his later attempt to capture Luffy as a means to attain the Shichibukai position left by Crocodile. However, during the mass breakout attempt in Impel Down, when Luffy learned that the man he met on Jaya was Blackbeard, the one responsible for Ace's capture and impending execution, Luffy flew into a rage and attacked him. The two almost got into a fight only for Jinbe to intervene and remind Luffy of his desire to save Ace. Luffy calmed down as Blackbeard admitted he underestimated Luffy's strength. Though this encounter led to them becoming enemies, Blackbeard continued to encourage Luffy to pursue his dreams.
Two years later, during the Dressrosa Arc, Luffy spoke with Blackbeard and greeted him in a hostile manner as Blackbeard jovially greeted him and stated Burgess would win the Mera Mera no Mi before Luffy swore that would not happen. During the Zou Arc, Luffy was told how the Blackbeard Pirates defeated the Whitebeard Pirates remnants, and usurped the vacant Yonko position, which further infuriated Luffy. In the Whole Cake Island Arc, Luffy was even more angered to learn that Blackbeard and his crew attacked the Revolutionary Army's base at Baltigo, which put his father and Sabo in danger.
Luffy initially thought of Big Mom as a good person for protecting Fishman Island in place of Edward Newgate. However, this soon changed when Luffy realized that she is willing to destroy a country for candy. When Fishman Island is under the threat of facing Big Mom's wrath for the lack of candy, Luffy talked with the Yonko and took the blame on himself by saying he ate all ten tons of candy. Linlin refused Luffy's offer of treasure in place of the candy and decided to target Luffy in place of Fishman Island. Luffy declared that he would defeat her in the New World and would make Fishman Island his territory as she reacted in anger. In the Zou Arc, Luffy's hostility towards Big Mom grew when he learned that Sanji would be forced to marry one of Big Mom's daughters and join her crew.
After Luffy invaded Totto Land and defeated Cracker, Big Mom's rage towards Luffy swelled as she unleashed a ferocious storm and sent an army to battle him. When Luffy and Nami were captured and imprisoned, Big Mom contacted them through a Den Den Mushi and told Luffy that she was willing to let him and his crewmates leave safely due to her promise to Sanji, but threatened them to show them "hell" if they ruined Sanji and Pudding's wedding ceremony. Ignoring the Yonko's threats, Luffy continues to challenge her.
After Sanji informed Luffy that he could not leave Totto Land and allow Big Mom to murder his family, Luffy declared that he and the rest of the Sanji retrieval team would help Sanji wreck one of Big Mom's most significant plans.
Since Luffy agreed to collaborate with Law in defeating Kaido and decimating his forces, that would make Luffy an enemy of Kaido as well. Even though Law stated that the chances of success are slim, Luffy isn't afraid to oppose Kaido and even declared that he will defeat all of the Yonko. After hearing about how his subordinate Jack devastated the Mink Tribe, Luffy angrily declared he would make them both pay one day.
When Luffy fought Caesar Clown, the scientist warned him that he was protected by many powerful people in the blackmarket underworld and defeating him would incite their fury. This did not bother Luffy as he had already been fighting people like that since coming to the Grand Line and took the mad scientist down. All the brokers watching reacted with shock and anger, with one saying the underworld could not stay quiet about this. Upon defeating Doflamingo, the most influential man in the underworld, many buyers became angry with Luffy over the deals he cost them, one even stabbing his wanted poster. A large group of these dealers even formed an alliance to kill Luffy and get revenge, only to be stopped by Issho.