One Piece Encyclopedia


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For the boss of the centaurs, see Brownbeard.

Boss is a unique large beetle from the Little East Blue Arc. He was originally a creation of Dr. Indigo made only for the destruction of East Blue, but escaped.


Boss evolution

Boss after molting.

Boss is a large, brown horned beetle with tusk-like pincers. He has pink fur behind his head. He also bears the insignia of the Marines on his right side, which Yoko painted on his shell after befriending him. After molting, he grew in size, changed color into teal, and the fur behind his head became light green. His tusks also became bigger and gained a second set of points, and now featured small openings in the front, from out of which he could breathe fire. 

When he initially met Yoko, Boss was a lot smaller and had a shiny, caramel-colored body, before molting and growing larger. It was around this time that Yoko gave him his Marines marking, which Boss somehow manages to preserve after molting.


Boss is a very brave and intelligent beetle. He is willing to protect Little East Blue and its inhabitants at any cost, even to the point where he tried to give himself up to the Amigo Pirates to spare everyone else. He also has a very strong bond with Yoko, a young girl who lost her father to pirates.

Abilities and BiologyEdit

Unlike regular beetles, Boss continues to grow and to change shell even as an adult, this causing his unusual giant dimensions. He becomes stronger every time he grows up (once a month), making him a very powerful fighter, capable of emitting fire from his horn.

He has an incredible stamina, which allowed him to resist to Franky's Coup de Vent and Luffy's Gomu Gomu no Bazooka without serious wounds, and Yoko said that he can heal quickly overnight underground by incubating.



According to the Amigo Pirates, he  was a runaway from Shiki the Golden Lion, who had been creating an army of super animals to take over the world.

Boss and Yoko

Boss and Yoko together.

He lived in Little East Blue with Yoko, an orphan girl who found him in the forest some time after her father's death and got attached to the beetle seeing her lost father in him. Since then, Boss protected the island from the pirates.

Little East Blue ArcEdit

Before finding out that Yoko was his owner, Luffy wanted to capture it and have it be their 10th member of his pirate crew. He later dropped this idea after seeing Yoko's determination, yet challenged Boss to a fight after he became stronger, something he agreed to.

When he was preparing for the evolution, Little East Blue was attacked by the Amigo Pirates, who wanted to capture him as a gift for Shiki. After being defeated by Largo and Corto, Boss agreed to follow the pirates to save the island from the hands of the Amigo Pirates, but was stopped by Luffy who wanted to continue their challenge.

After being hit by Straw Hat, Boss molted into a new form and attacked the pirates again, managing to free Luffy, Zoro and Sanji from their nets, but falling again under the attacks of Largo because his mutation had been too fast and his power was not completely restored. Freed from the net by Zoro, Boss was able to regain some of his power, which he used to defeat Corto first, and then to rescue Luffy and Brook who had fallen into the ocean after their battle with Largo.

He and the Straw Hats' captain eventually had their match, but it ended in a draw since none of them wanted to give up. In the end, Boss stayed with Yoko and the other inhabitants of Little East Blue, continuing his work as their protector, though Luffy did promise as he was leaving they would continue their fight again someday.

Major BattlesEdit


  • He has the Marine logo painted on his right side, which is something Yoko gave him, and this Marine logo seems to keep even when he changes his shell.
  • Boss is one of the few animals who Luffy invited to join his crew.

Site NavigationEdit

[v · e · ?]
Little East Blue
Civilians: Fabre  •  Yoko  •  Ryudo  •  Mitsuboshi  •  Luigia  •  Orenami Fanclub  •  Mendo  •  Boss
Related Articles
Story Arcs: Little East Blue Arc
[v · e · ?]
Movies and Specials Characters
Protagonist Individuals: Tobio  •  Ganzo  •  Akisu  •  Borodo  •  Meroie  •  Hamu  •  Mobambi  •  Anaguma  •  Amanda  •  Maccus  •  Bonney  •  Shuraiya Bascùd  •  Maya  •  Lacos  •  Izaya  •  Brief  •  Randolph  •  Roba  •  Mao  •  Yoko  •  Fabre  •  Boss  •  Billy  •  Schneider  •  Buzz  •  Mobston  •  Bolt  •  Marin  •  Zomino  •  Gari  •  Purin  •  Homey  •  Diego  •  Regis  •  Lily Enstomach  •  Panz Fry  •  Minoru Kazeno  •  Kinoconda  •  Myskina Olga  •  Elizabeth  •  Myskina Acier  •  Livia  •  Chavez  •  Carina
Protagonist Groups: Tearoom Pirates  •  Mustache Pirates  •  Schneider Pirates  •  Golden Lion Pirates
Antagonist Individuals: El Drago  •  Golass  •  Joke  •  Bear King  •  Honey Queen  •  Pin Joker  •  Skunk One  •  Boo Jack  •  Governor  •  Lego  •  Jim  •  Butler  •  Heaby  •  Hotdog  •  Zap  •  Bayan  •  Drake  •  Gasparde  •  Needless  •  Saga  •  Shichiseiken  •  Toma  •  Bismarck  •  Boo Kong  •  Omatsuri  •  Lily Carnation  •  DJ Gappa  •  Muchigoro  •  Four Wise Men  •  Kotetsu  •  Ratchet  •  Maji  •  Honki  •  Musshuru  •  Shiki  •  Indigo  •  Scarlet  •  Kitajima  •  Shuzo  •  Alpacacino  •  Z  •  Ain  •  Binz  •  Bilic  •  Byrnndi World  •  Byojack  •  Gairam  •  Sebastian  •  Nightin  •  Komei  •  Dojaku  •  Kansho  •  Mad Treasure  •  Psycho P  •  Naomi Drunk  •  Gild Tesoro  •  Baccarat  •  Dice  •  Tanaka
Antagonist Groups: Hyena Three  •  Trump Siblings  •  Bayan Pirates  •  Gasparde Pirates  •  Red Arrows Pirates  •  Golden Lion Pirates  •  Neo Marines  •  World Pirates  •  Long Long Pirates
Miscellaneous: Woonan  •  Kirin Lion  •  Bald Parrot  •  Karasuke  •  M. Danbo  •  Odacchi  •  Bobby  •  Milia  •  Holy  •  Lola  •  Pogo  •  Willy  •  Gonzo  •  Bigalo  •  Biera  •  Rosario  •  Daisy  •  Papa  •  Rick  •  Rosa  •  Suita  •  Jotto  •  Alan  •  Ever  •  Xiao  •  Mendo  •  Luigia  •  Mitsuboshi  •  Ryudo  •  Koba K  •  Shorts  •  Tsubaki  •  Bonbori  •  Bit  •  Lepre  •  Raise Max  •  Stella 
[v · e · ?]
Golden Lion Pirates
Members: Shiki  •  Indigo  •  Scarlet  •  Nami   •  Mutant Animal Army (Billy   •  Boss )
Allies: Amigo Pirates (Largo  •  Corto)  •  Kitajima
Ships: Island Ship
Devil Fruit based: Fuwa Fuwa no Mi  •  Ami Ami no Mi
Weapon based: Oto and Kogarashi
Others: SIQ  •  Daft Green
Related Articles
Movie and Other media: One Piece Film: Strong World  •  Chapter 0  •  Episode 0 OVA
Locations: Edd War  •  Impel Down  •  Merveille
Others: Battle in Edd War  •  Roger Pirates
[v · e · ?]
Animal Species
Four Blues
East Blue: Pinky
South Blue: Blue-Finned Elephant Tuna  •  Super Sparrow
West Blue: Island Whales (Laboon)
Grand Line
General: Royal Squid  •  Sea Monkey  •  Sea Cow (Mohmoo)  •  Giant Seaturtle  •  Sea Rabbit  •  Kappa Whale
Island Specific: Dinosaurs  •  Kestia  •  Goldfish (Island Eater)  •  Giant Dolphin  •  Hiking Bear  •  Lapahn  •  Reindeer (Tony Tony Chopper)  •  White Walkie (Robson)  •  Snow Birds  •  Camel (Eyelashes)  •  Bananawani  •  Moving Crab (Scissors)  •  Banchi  •  Super Spot-Billed Duck (Carue  •  Super Spot-Billed Duck Squad)  •  Kung-Fu Dugongs  •  Sandora Catfish  •  Sandora Lizard  •  Giant Sandora Lizard  •  Sea Cat  •  Warusagi Birds  •  Desert Strawberry  •  Giant Gecko  •  South Bird  •  Sumo Frog (Yokozuna)  •  Yagara Bulls  •  Rabuka Bulls  •  King Bulls (Sodom  •  Gomorrah)  •  Humandrills
White Seas: Sky Fish  •  Sky Shark  •  Sky Eel  •  South Bird  •  Cloud Wolf  •  Giant Python (Kashigami  •  Nola)  •  Speedy Shrimp  •  Super-Express Speedy Shrimp  •  Fuza  •  Octopus Balloon
Global and Other Animals
Sea Kings: Lord of the Coast  •  Master of the Waters
Den Den Mushi: Regular Den Den Mushi  •  Baby Den Den Mushi  •  Black Den Den Mushi  •  Golden Den Den Mushi  •  Silver Den Den Mushi  •  Surveillance Den Den Mushi  •  Visual Den Den Mushi
Calm Belt: Snake Weapon (Salome)  •  Yuda  •  Blue Gorillas  •  Puzzle Scorpion  •  Manticores  •  Basilisk  •  Sphinx  •  Wolf Unit
Unknown Origin: Dragon  •  Panda Shark  •  Hattori  •  Flying Fish  •  Surume  •  Sea Lion  •  Monstar  •  Daidalos
Merveille: Scarlet  •  Fat Lion  •  Land Gator  •  Mori Dako  •  Don Kamakiriri  •  Terror Guma  •  Guntai Ari  •  Baku Zame  •  Screen Buffalo  •  Billy  •  Shimatori  •  Zarley Davidson  •  Black Brothers  •  Boxer Penguin  •  Big Tree  •  Tsujigiri Itachi  •  Kung-Fu Dot  •  Batta GT-7000  •  Hippo Iron  •  Monkey Trooper  •  Boss  •  Agehaguera  •  Batch Fly  •  Cowball  •  Del Kong  •  Erimakitokageps  •  Ettousaurus  •  Groggysaurus  •  Hammer Isoginchaku  •  Ikahula  •  Jura Chou  •  Kaen Kabuto  •  Kill Rabi  •  King Umi Mukade  •  Kubinagaryuu  •  Mammoth Dense  •  Maou Game  •  Meteor Ibex  •  Miyama Emperor  •  Shogun Jishi  •  Spider Tank  •  Toramata  •  Oh Imomushi  •  Dasoku  •  Giragon  •  Seiuchi Mountain  •  Golden Bat
Non-Canon: Giant Gecko  •  Kirin Lion  •  Bald Parrot  •  Karasuke  •  Horn Eaters  •  Trumpet Pig  •  Square Rhinos  •  Sea Raccoon  •  Rosario  •  Mecha Island  •  Bolt  •  Kinoconda  •  Elizabeth  •  Bonbori  •  Chavez

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