Who's Who

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.