Character 198 of 204 · One Piece
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Who's Who

Villain Alive First: Chapter 978

Who's Who is a former CP9 agent turned Tobiroppo in Kaido's crew. He wields the Neko Neko no Mi Model: Saber Tiger and carries deep resentment over his imprisonment after the Gomu Gomu no Mi was stolen on his watch.

Biography & Character Analysis

Who's Who is one of Kaido's Tobiroppo — the six most powerful Shinuchi in the Beasts Pirates, one tier below the All-Stars. Before joining Kaido, he served as a World Government agent in CP9, the organization's elite espionage and assassination unit. His path from spy to pirate was forced: he was imprisoned in Impel Down after a World Government Devil Fruit shipment was stolen on his watch. The fruit in question turned out to be the Gomu Gomu no Mi — actually the mythical Zoan Hito Hito no Mi, Model: Nika — which ended up in Luffy's hands.

Who's Who escaped Impel Down and eventually joined Kaido's crew as a Tobiroppo. He wields the Neko Neko no Mi, Model: Saber Tiger, an Ancient Zoan that transforms him into a massive sabertooth tiger hybrid. His Rokushiki techniques from CP9 training remain sharp, giving him a versatile fighting style that combines predatory zoan power with government assassin discipline.

During the Onigashima Raid, Who's Who faced Jinbe in the Pleasure Hall. He disclosed knowledge of the "Sun God Nika" — information he heard from a guard during his imprisonment — apparently aware that this knowledge was considered dangerous by the World Government. Jinbe ultimately defeated him after a prolonged battle.

His defeat represented not just a tactical loss for the Beasts Pirates but a personal failure in his vendetta: Jinbe, who had once indirectly contributed to his original imprisonment through the chain of events involving Luffy's fruit, survived and moved on.

Overview

Who’s Who occupies a fascinating position in One Piece’s Wano arc: he is simultaneously a high-tier villain and a character defined by institutional failure. His entire trajectory — from CP9 agent to Impel Down prisoner to Tobiroppo pirate — stems from a single event outside his control, and the resentment it left drives his motivations more than loyalty to Kaido ever did.

As a Tobiroppo member, Who’s Who sits at the top tier of Kaido’s command structure below the All-Stars. His combat capability combines the raw power of an Ancient Zoan Devil Fruit with the precision of CP9’s Rokushiki training, making him a fundamentally different kind of fighter from most Beasts Pirates.

Powers and Abilities

The Neko Neko no Mi, Model: Saber Tiger gives Who’s Who access to the physiology of an ancient, extinct predator — one historically more powerful than any modern big cat. In hybrid form, he gains massive claws, enhanced speed and strength, and the predatory instincts of a sabertooth tiger. In full beast form, he becomes an enormous sabertooth capable of devastating physical attacks.

His CP9 background adds Rokushiki to his arsenal: Soru (supersonic movement), Rankyaku (air slashes), Tekkai (iron body defense) and other techniques trained into him during years of government service. This combination of ancient predator power and government assassin technique makes him particularly dangerous.

History and Backstory

Who’s Who’s most significant revelation comes during his fight with Jinbe: he was a CP9 agent responsible for transporting a specific Devil Fruit — later revealed to be the Gomu Gomu no Mi, which the World Government knew was actually the mythical Hito Hito no Mi, Model: Nika. The fruit was stolen by Shanks’ crew before reaching its destination. Who’s Who was imprisoned for this failure despite having no actual control over the theft.

In Impel Down, he heard about the Sun God Nika from a prison guard who was later executed for spreading that information. The World Government apparently considered knowledge of Nika’s existence dangerous enough to kill over. Why Who’s Who chose to reveal this to Jinbe mid-battle — seemingly expecting his imminent defeat — suggests he had nothing left to lose.

Wano Arc and Defeat

During the Onigashima Raid, Who’s Who encountered Jinbe after the Straw Hats infiltrated Kaido’s stronghold. The fight was both tactical and personal: Who’s Who blamed the chain of events that imprisoned him on Luffy (who ended up with the fruit) and by extension on everyone connected to him.

Jinbe defeated Who’s Who with his Fishman Karate, which channels water through the body for devastating strikes. The defeat ended Who’s Who’s vendetta without resolution — Jinbe survived, the stolen fruit turned out to be something far beyond anything Who’s Who understood, and his role in the larger story of the Gomu Gomu no Mi amounted to a footnote.

Legacy

Who’s Who is one of Wano’s most well-characterized mid-tier antagonists precisely because his motivations are comprehensible. He is not evil by conviction but by circumstance — a man whose career was destroyed through no fault of his own, who spent years in the world’s worst prison, and emerged with nowhere to go but Kaido’s crew. His knowledge of Nika hints at awareness that threads through the World Government’s deepest secrets, making him more narratively significant than his defeat might suggest.

Abilities & Skills

Neko Neko no Mi, Model: Saber Tiger (Ancient Zoan)
Rokushiki (CP9 superhuman techniques)
Haki — Armament and Observation
Sabertooth tiger hybrid and full beast transformation

Relationships (3)

K
Kaido companion

Emperor he serves as Tobiroppo

J
Jinbe antagonist

Opponent in Wano who defeated him; connected to his original downfall

M
Monkey D. Luffy antagonist

Indirect cause of his imprisonment — carried the fruit Who's Who failed to protect

Story Arc Appearances

Who's Who in the One Piece series

Who's Who is one of the named characters of One Piece, with a role in the series classified as villain. Like every named character in long-form serialized manga, Who's Who is best understood not in isolation but in the context of the broader cast and the series' structural movement across its arcs. The relationships Who's Who forms with other characters, the conflicts Who's Who participates in, and the thematic weight Who's Who carries are all developed across multiple volumes — and the most rewarding reading approach is to encounter Who's Who within the natural flow of the manga rather than through isolated character study alone.

How to follow Who's Who

To follow Who's Who's arc across the One Piece manga, the most direct approach is to read the series in tankōbon order from volume 1. Most named characters in long-form shōnen are introduced gradually, with their motivations and relationships established across the arcs in which they appear. Skipping ahead to Who's Who's most prominent moments without reading the prior volumes typically results in losing the emotional weight that the character's development earns through accumulated context. The official English-language release through VIZ Media, Spanish editions through Norma Editorial / Planeta / Distrito, and other regional publishers all make the manga available in straightforward tankōbon format.

For readers who prefer the anime, Who's Who appears across the relevant seasons of the One Piece anime adaptation. Following Who's Who through the anime in broadcast order produces a different rhythm than reading the manga — the anime adds voice acting that brings the character's dialogue to life in ways the manga's text alone cannot, while the manga preserves the original panel composition and pacing of the character's introduction and key scenes. Both approaches are valid; the most rewarding is to engage with both the manga and anime versions and compare how each medium treats the character's development.

Why Who's Who matters

Who's Who's thematic significance within One Piece is best understood through the relationships and conflicts the character participates in across the manga's arcs. Long-form shōnen series typically use their cast to develop multiple parallel themes — what loyalty looks like under pressure, how individual moral commitments interact with institutional demands, what relationships can survive ideological conflict — and Who's Who contributes to these thematic conversations through specific choices and confrontations across the volumes. Reading the character in arc-by-arc context reveals patterns that single-arc focus misses entirely.

The cast of One Piece is large and interconnected, and Who's Who's relationships with other named characters — especially the protagonist and key supporting cast — develop across the manga in ways that single-issue summaries cannot capture. The most rewarding reading approach is to follow Who's Who alongside the broader cast through the natural flow of the published volumes rather than through character-isolated study.

Start reading One Piece

If this is your first encounter with the One Piece universe and you arrived here looking for context on Who's Who, the most useful next step is to begin reading the manga from volume 1. Long-form serialized manga is structurally designed for sequential reading; the cast, cosmology, and thematic preoccupations build on each other across volumes, and arriving at any individual arc, character, or group out of context typically loses the emotional weight that earlier setup makes possible. Volume 1 of One Piece is widely available through legal channels in print and digital format, and most readers find that the opening volumes establish the world and cast clearly enough that the broader arcs become accessible from there.

For readers who have already engaged with parts of One Piece and are returning for additional context on Who's Who, the natural next step is to revisit the volumes immediately surrounding Who's Who's most prominent appearances. Re-reading rewards close attention; the foreshadowing the author plants in earlier arcs lands differently on a second pass, and Who's Who's significance often becomes clearer when read alongside the surrounding cast and arc material rather than in isolation.

Community and resources

Beyond the manga and anime, the One Piece community has produced a substantial volume of secondary material that may be useful for readers seeking deeper context on Who's Who. This includes character analysis essays, arc breakdowns, fan-translated supplementary material, and discussion forums on platforms including Reddit's r/OnePiece community and the official One Piece fan wikis. While Mangaka.online provides editorially structured information about the series, the broader fan community provides interpretive material that complements rather than replaces the canonical sources.

For readers wanting to extend their engagement with One Piece beyond reading the manga and watching the anime, additional channels include: official guidebooks and databooks released by the publisher (which often contain author interviews and supplementary worldbuilding material not present in the main manga), official artbooks featuring color illustrations and character design notes, video interviews with the author when available, and the regular cycle of new merchandise that accompanies major franchise milestones. The full ecosystem around One Piece is one of the most extensive in modern shōnen, and engagement with that ecosystem deepens the reading experience considerably.

Questions about Who's Who

Where does Who's Who fit in One Piece?
Who's Who is part of the broader narrative of One Piece. It appears across multiple volumes of the published manga.
Should I read Who's Who before the rest of One Piece?
No. One Piece is a long-form serialized manga that builds on itself volume by volume. Reading Who's Who in isolation typically loses the structural setup that the surrounding arcs provide. The recommended approach is to read the series from volume 1 in tankōbon order.
Where can I read One Piece?
One Piece is published in English by Viz Media or Kodansha (depending on the series), in Spanish by regional publishers including Norma Editorial, Planeta Cómic, and Distrito Manga, and in other major markets by their respective licensed publishers. Both print tankōbon volumes and digital editions are widely available through Amazon and major bookstore retailers. Recent chapters are also available legally through Shueisha's Manga Plus platform.

Who's Who collectibles

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FAQ: Who's Who

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