
Scratchmen Apoo, the Roar of the Sea, captains the On Air Pirates and counts among the Worst Generation. A music-obsessed schemer of the Longarm Tribe, he secretly served Kaidou as an informant, setting rival captains up for the Beasts Pirates.
As a member of the Longarm Tribe, Apoo's most striking trait is a pair of unusually long arms, each bending at two elbows, which let him reshape his limbs into instruments without contorting. A broad chest helps him boom out drum tones, and his teeth are patterned to look like piano keys. His whole presentation leans into a DJ motif: orange headphones stamped with his name, hair pulled tight into jagged lightning-bolt roots, and a flowing red gown marked with the kanji for sound. After the timeskip he swaps to black headphones and adds ornamental rope fastenings and epaulets evoking a marine officer's uniform.
Boisterous and party-loving, Apoo carries himself like a radio personality, weaving dance and music through his every move. He is also an eager photographer and journalist, always chasing a story he can sell for profit. Generally he avoids needless fights, preferring to wait, watch, and strike from safe distance with surprise on his side. Beneath the loud exterior sits a cunning, treacherous mind: he played the loyal ally to Eustass Kid while secretly working for Kaidou all along, holds a low view of pirate alliances, and stays loyal to no one but himself, content to let enemies wear each other down before he finishes the survivor. His signature laugh, Apapapa, even mimics the scratch of a record.
A Worst Generation captain whose bounty climbed from 198 million to 350 million Berry, Apoo backs his showmanship with a dangerous Paramecia fruit, the Oto Oto no Mi. By morphing parts of his body into instruments and playing specific tunes, he unleashes sound waves that deal slashing, impact, or explosive damage to anyone who hears them, even slicing off Kizaru's arm in a surprise strike. He can narrow the effect to targets he is looking at, and the attacks land almost instantly within hearing range. The catch is that covered ears render a foe immune, and an opponent outside earshot stays safe, so the power suits first encounters best.
He wields a pair of tonfas in close quarters, trading blows even with a transformed X Drake, and shows notable agility and durability. Apoo also commands both Armament and Observation Haki, using hardening to survive a CP0 agent's lethal neck strike. As the Beasts Pirates' informant he held authority over the unruly Numbers, summoning the giant Hatcha during the raid on Onigashima.

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Scratchmen Apoo secretly served as an informant for Kaidou throughout the story, posing as a loyal ally to Eustass Kid while feeding information to the Beasts Pirates, and he held enough authority in Kaidou's crew to summon the giant Hatcha during the raid on Onigashima.
Scratchmen Apoo ate the Oto Oto no Mi, a Paramecia Devil Fruit that lets him turn parts of his body into instruments and unleash sound waves that inflict slashing, impact, or explosive damage on anyone within earshot.
No, Scratchmen Apoo did not betray Kaidou; instead he acted as Kaidou's secret informant, pretending to be Eustass Kid's loyal ally while quietly working for the Beasts Pirates all along.
Scratchmen Apoo is portrayed as a treacherous, self-serving pirate captain with no real loyalty to anyone, content to let rivals wear each other down before striking, marking him as an antagonist among the Worst Generation.
Scratchmen Apoo captains the On Air Pirates and ranks among the Worst Generation, with a bounty that climbed from 198 million to 350 million Berry.
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