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Hack is a soldierfish fish-man who teaches combat for the Revolutionary Army. Carrying the title "Hundredth Dan," he traveled to Dressrosa to probe its weapons trade and entered the Corrida Colosseum to chase the Mera Mera no Mi.

Japanese Voice: Kousei Hirota
Birthday: August 9th
Age: 38
Height: 280 cm
Status: Alive
First Appearance (Manga): Chapter 706
Crew & Affiliations: Revolutionary Army
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Appearance

Towering and heavily built, Hack stands out through his flowing pale blue hair and a thick blue mustache. His skin is yellow, marked by brown speckling across the crown of his head, and the scales beneath his eyes, the gills along his neck, and his pointed teeth all betray his fish-man heritage. For clothing he favors an open martial-arts gi cinched with a black belt, an outfit reminiscent of the fighter Kuroobi.

While under the toy curse, his form was reshaped into that of a dog, though his original coloring carried over.

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Personality

Composed and self-assured, Hack treats combat as something sacred, chasing a philosophy that genuine bonds can be forged through trading blows. That conviction keeps him fighting and makes him scornful of anyone who treats a match as a joke. He considers striking from behind dishonorable, yet he set that principle aside for Bartolomeo, whom he judged unworthy of courtesy after the rookie relieved himself at the edge of the arena rather than taking the bout seriously.

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Abilities

His fish-man physiology grants Hack roughly ten times a human's raw power, enough to clamp down on a giant gladiator's spiked club and freeze the weapon in place. He is a hundredth-level master and instructor of Fish-Man Karate, dropping foes larger than himself with single strikes, and he also practices Fish-Man Jujutsu. Toughness is his weak point, however, since a kick from Bartolomeo felled him after his hand shattered against a barrier. Over the years he trained countless orphans, including Sabo and Koala, the latter rising to become a karate instructor in her own right. He counts the Warlord Jinbe among his closest friends and shares his dream of unity between humans and fish-men, though Hack prefers to build that goodwill through fists.

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Frequently Asked Questions

Who is Hack in One Piece?

Hack is a soldierfish fish-man who serves as a combat instructor for the Revolutionary Army, holding the title Hundredth Dan in Fish-Man Karate. He traveled to Dressrosa to investigate its weapons trade and entered the Corrida Colosseum while pursuing the Mera Mera no Mi.

What fighting style does Hack use?

Hack is a hundredth-level master and instructor of Fish-Man Karate, and he also practices Fish-Man Jujutsu, capable of dropping opponents larger than himself with a single strike.

How did Hack lose in the Corrida Colosseum?

Hack was eliminated after attacking Bartolomeo from behind, only for the barrier around the ring to shatter his hand and leave him broken on the floor.

Who did Hack train in the Revolutionary Army?

As a Revolutionary Army combat instructor, Hack trained many orphans over the years, including Sabo and Koala, with Koala later becoming a karate instructor herself.

What happened to Hack under the toy curse on Dressrosa?

After his defeat, Hack was thrown into an underground cell and cursed into a toy dog, forced into labor until Sugar's collapse broke the curse and he reunited with Sabo, Koala, and Nico Robin.

Sources & Information

Looking for more on Hack? The One Piece Wiki on Fandom has a dedicated page with community notes.

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This content is original writing by Daddy Jim Headquarters based on the One Piece anime series, manga, and official materials. Episode and chapter references are cited where applicable.

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Character and scene imagery on this site is original artwork by Daddy Jim Headquarters, not screenshots or licensed imagery. Official cover art is used on three types of pages for editorial commentary:

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  • Manga chapter pages: Jump Comics volume covers, credited to Shueisha and Eiichiro Oda.

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