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Lieutenant Commander Helmeppo is a Marine officer and Morgan's son. Once a spoiled child who took advantage of his father's status, he is now a lieutenant commander  who trained with Coby under Vice Admiral Garp. Due to his actions when he was first introduced, he can be considered a minor antagonist of the Romance Dawn Arc.
When Helmeppo first appeared, he was a skinny and lanky-looking young man with light blonde hair shaped like a sideways oval on top of his head. He also has a cleft chin.
Originally, he wore dark purple uniforms with white shoes and a rubber band ring on his left hand while his father was still in power. After his father Morgan was defeated, he wore a standard marine "cabin boy" uniform. After his extensive training with Garp, he started wearing a white shirt with a pale green vest over it, purple pants, black gloves, and a rather odd-looking black visor.
He also now has longer hair tied back into a ponytail as well as having a more muscular appearance compared to his original look.
After the timeskip, Helmeppo wears a hat, junior officer's marine coat, and a scarf. Unlike most other officers however, Helmeppo does not wear his coat as a cape, but puts his arms through the sleeves.
Helmeppo used to be a coward who hid behind his father's wealth and power. He began to shun others and belittle them with the knowledge that his father was greatly feared. Whenever someone disagreed with him he'd threaten to tell his father on them and have them killed. Helmeppo showed that he wasn't as cruel as his father when he became horrified by Morgan's orders to kill a child. Despite this, Helmeppo loved his father and thought he loved him back. His father hits him when Helmeppo asked him to kill Luffy for hitting him, after which Morgan revealed how he thinks of Helmeppo as a worthless son.
He lost his luxurious life that he had under his father's rank after his father was kicked out. He was forced to become a chore boy alongside Coby, whose friendly approaches were turned down. Part of Helmeppo was still loyal to his father which was evident when he was seen crying before his father's execution. However, he later realizes that his father is as brutal and murderous as the pirates he claimed to oppose and disowns him. This finally cut his last tie to his father and pushed him to change, becoming braver and less of a spoiled brat. Eventually he and Coby become good friends.
Helmeppo matures by the events of Water 7, even referring to himself as "that bratty, selfish son who lived off his father's status". Now a lieutenant commander alongside Coby, he continues his training in the Marines. His appearance has changed as his hair have grown to his shoulders and he now wears a visor. He was deeply (and comically) upset when Zoro and Luffy did not realize who he was and seemed equally upset when they did not say goodbye to him either.
Helmeppo seems to be more levelheaded than Coby when it comes down to analyzing situations as Coby is more aggressive. After the time skip he has developed a penchant for being overly formal, even with Coby.
Helmeppo previously thought that he had a very good relationship with his father Morgan. Before meeting Monkey D. Luffy and Coby, Helmeppo took advantage of his father's position as a tyrannical Marine Captain to act as he pleased, believing his father would back him up should anything threaten or displease him. To his shock, however, when Helmeppo tried to call for his father to get back at Luffy for punching him, Morgan instead smashed his son with the back of his ax-hand for trying to order him around, revealing that he had no fatherly affection for him and even considered Helmeppo a worthless son not worth hitting. Despite this, Helmeppo remained delusional of his relationship with his father and tried to assist him in defeating Luffy by taking Coby hostage. After Morgan was stripped of his rank and incarcerated, he escaped and took his son hostage, at which point Helmeppo finally disowned his father and changed his personality.
Monkey D GarpEdit
Garp is the mentor of Helmeppo and Coby. He keeps them out of trouble and ensures that they are not slacking off. If they do get out of hand, he knocks them around to ensure they know their place.
After his father was kicked out of the Marines, Helmeppo lost access to the luxurious life that he once held under his father's rank. He was forced to become a chore boy alongside Coby, and despite Coby's good-natured attempts to befriend him, he refused any of it. After being kidnapped by his own father and held hostage, Helmeppo disowned his father and started changing, becoming braver and less of a spoiled brat. Eventually, Coby and Helmeppo become good friends. Now they are working together. In addition, Helmeppo seems to care for Coby, and he rushed to help him after being defeated by Luffy.
Abilities and PowersEdit
Having trained alongside Coby in the Marines, Helmeppo has gained some measure of fighting ability. Helmeppo's weapons of choice are a pair of kukri, which he keeps at the back of his waist with his belt. He was seen using them against Zoro when they met again in Water 7. However, he was still no match for Zoro.
Before becoming an actual Marine, Helmeppo's only weapons include a simple flintlock and his father's status.
East Blue SagaEdit
Romance Dawn ArcEdit
Helmeppo was Morgan's bratty son who lived off of his wealth. He unleashed his wolf, Soro on the townsfolk of the nearby town one day and Zoro killed it to defend Rika. In anger, Helmeppo had Zoro arrested for killing his pet. Zoro would be released after starving for a month.
Helmeppo caught Rika trying to give Zoro food twenty days later. He had her tossed over the wall of the Marine base after stomping on some onigiri she made (though luckily, Luffy catches her). Later, Luffy overhears him bragging about going back on his promise to Zoro and Luffy hits him.
Helmeppo runs back to his father to get him to kill Luffy, only to have his father hit him for giving him orders. When Luffy invades the base to get back Zoro's swords, he uses Helmeppo as an unwitting guide and shield against the marines that come after him till Helmeppo faints. He is later seen holding Coby hostage in an attempt to stop Luffy from beating his father. The attempt fails however and he is taken out with a punch from Luffy.
Diary of Coby-MeppoEdit
After Morgan is defeated, he does petty work for the Marine Base in Shell Town along with Coby. At first, Helmeppo was furious at the loss of a luxurious life, and rejects Coby's attempt to befriend him, as well as crying over his father's imprisonment. However, later, when Morgan escaped and took Helmeppo as hostage, the latter starts to warm up to Coby and eventually becomes his friend after disowning his father (Coby had also saved his life by keeping the Marines from firing on the boat Morgan and Helmeppo were on).
During such time they meet Vice-Admiral Garp, who takes them to his own base on the Grand Line to watch over and helps guide their progress. From Garp's brutal training, Helmeppo becomes skilled in the use of kukri, though Zoro still takes him down without any difficulty. He is far less arrogant than he used to be (even referring to himself as "that idiot who paraded on his father's power").
Water 7 SagaEdit
Post-Enies Lobby ArcEdit
After the Straw Hat Pirates return from their raid against Enies Lobby, Helmeppo and Coby confronted them in Water 7, but both were defeated easily. While Luffy and Zoro remembered Coby, they had no idea who Helmeppo was, much to Helmeppo's dismay. Helmeppo was later shocked to hear from Garp that Revolutionary Dragon was his son and Luffy's father.
Submit War SagaEdit
Along with Monkey D. Garp and Coby, he reported to Marine Headquarters in order to fight against the Whitebeard Pirates. Three hours before Ace's execution, he was seen with Coby listening to Sengoku's speech about Ace's past. After hearing that Ace is Gol D. Roger's son, he and Coby came to a conclusion that Ace and Luffy are not real brothers. He ran away from the battle along with Coby and witnessed Akainu's wrath on a marine who did the same. He and Coby then saw Luffy and company fall from the sky.
Luffy's unconventional arrival at Marineford had both him and Coby stunned. When Sengoku announced that Luffy is Dragon's son, Helmeppo, along with Coby, are shocked to see that the Fleet Admiral decided to reveal such information.
Moments before the arrival of Red-Haired Shanks, he tries to help Coby get back on his feet while Coby is hearing voices in his head disappearing. When Coby tries to stop Admiral Akainu and the Marines from more needless fighting against pirates with no will to fight, Helmeppo panics for the life of his friend, knowing that the Admiral would not accept something like that from an underling.
Coby is taken to the Marine Headquarters healing center, with other injured soldiers, and Helmeppo stays at his bedside. Coby is still clearly traumatized by the events. Doctor Fishbonen tells them that what Coby is feeling is Haki.
Doctor Fishbonen informs Coby that all Vice Admirals are able to use Haki, and that Garp should be able to help him. Helmeppo feels jealous that Coby seems to have advanced in skill, though Coby claims to not have known about the ability in the first place.
One Piece Film: ZEdit
After Firs Island got destroyed by Zephyr, Helmeppo appears on a Marine battle ship along with Coby and Garp, who reveals to him the existence of Zephyr. Later, after the destruction of Secon Island, Garp and Sengoku explain to him about Zephyr's past.
Concludes non-canon section.
- Helmeppo and Coby vs. Morgan
Translation and Dubbing IssuesEdit
In the 4Kids version of the series, when Helmeppo holds a gun to Coby's head, the weapon was changed into a spring loaded hammer. However, the hammer was roughly edited and could be seen as a gun during a split-second.
- Helmeppo was shown to have smoked in One Piece Green: Secret Pieces.
- Helmeppo was the second fastest of promotion in two years as the first was held by Coby, from Seaman Recruit to Lieutenant Commander.