Scratchmen Apoo, also known as "Roar of the Sea", is the captain of the On Air Pirates and an informant for the Beasts Pirates, led by Kaido of the Four Emperors. He is a member of the Longarm Tribe and one of twelve pirates who are referred to as the "Worst Generation", being one of the eleven supernovas who came to Sabaody Archipelago two years ago with a bounty of over Beli.100,000,000. Due to his actions and role, he is a supporting antagonist in the Wano Country Arc. Being of the Longarm Tribe from the Grand Line, one of Apoo's distinguishing traits is his incredibly long arms. Each of these long arms possesses two elbow joints instead of just one, making them much longer than a normal person's. These arms make it possible for him to utilize his Devil Fruit powers without the need to contort the said limbs, whenever he converts them into makeshift instruments. Apoo also has a rather broad chest cavity, which may aid him in producing deep and bellowing drum-like sounds. Apoo's lower jaw is also somewhat wider than the upper half of his face, similar to Itomimizu of the Foxy Pirates. Besides these, his most distinguishing attributes are his unique physical characteristics and the objects adorned on him, all of which are music themed or related. His teeth have a unique look to them as they resemble piano keys. His fighting stance is also music themed as he appears like he's moving his hands in the same way a DJ would move theirs when mixing music on turntables.
He wears a set of orange headphones with his name on either side over his ears and hairstyle similar to Jabra's, where the hair on his scalp has been pulled tightly so that his roots resemble lightning patterns. A red Chinese garb with crew's Jolly Roger 音 ( oto?, "sound" or "music"), at the center of a large flower-like print splayed across the chest area, as well as on his back. Apoo also has a yellow scarf around his waist. He also has what seems to be the design of a green rose sewed on front of his left shoulder. In SBS Volume 64, Oda drew the Supernovas as children. Apoo is shown with significantly shorter hair and a rounder face. His hair was also combed into a pompadour in the front, with his braid in the back. His attire was a less elaborate shirt and bow tie. His teeth also lacked the dark markings that make them resemble piano keys. After the timeskip, he wears a set of black headphones, and changed to a different garb that has the kanji moved to the right side of his pants, ropes as buttons for the shirt, and epaulets on his shoulders. Apoo is an eccentric, boisterous pirate with an affinity for music and parties. A disc jockey by nature, Apoo employs dancing and music playing in many of his mannerisms, acting like a stereotypical radio personality. One reason he appears to enjoy being part of the Beasts Pirates is because of the "Golden Kagura" celebration they hold annually during every Fire Festival, making sure that he would not miss the latest. Apoo seems to be a passive individual who would not seek to harm others without a good reason. As a result, he is normally defensive during confrontations, postponing a brawl with Eustass Kid at a Sabaody Archipelago bar because they were about to finally head into the New World. Despite this, Apoo can be very curious at times, meaning he cannot deny himself as audience to an interesting battle should the opportunity present itself. When facing an opponent that is too strong for him, Apoo prefers to run away, although he enjoys provoking and taunting his enemies before leaving. Apoo is highly opportunistic, preferring to strike from a safe distance and through the element of surprise. Deceitful and treacherous, Apoo is smarter than he lets on. Despite having a bad relationship with Eustass Kid, Apoo was still able to feign cooperation and convincingly play the part of ally to him. Apoo has a low opinion of Pirate Alliances in general, believing that they only lead to eventual betrayal.
In spite of his usually outgoing and reckless character, Apoo can be rather cautious and distrustful of others. At the end of the Battle of Marineford, Apoo couldn't fathom why a pirate like Trafalgar Law would put themselves in potential danger to rescue someone, having been aware of the nasty rumors surrounding the "Surgeon of Death". This mindset has not changed much post-timeskip, especially when he finds himself in territory he perceives as hostile. Apoo wreaked havoc on Kid's hideout under the suspicion that a sniper could have been targeting him. He is also perceptive enough to sense killing intent emanating from others. As part of the Worst Generation, Apoo is a fearsome pirate who, with his crew, was able to survive the Grand Line's first half and ultimately enter the New World. Over the timeskip, his bounty rose from 198 million (sixth highest among the Eleven Supernovas of his generation) to 350 million, indicating his great strength. Despite his odd, eccentric looks and demeanor, Apoo has proven himself quite competent and no-nonsense in battle, especially with his peculiar yet dangerous Devil Fruit ability. Using it pre-timeskip on Sabaody, he was able to land two effective suprise attacks on (though failed to actually harm) Marine admiral Kizaru when none of the other Supernovas involved in the battle could even touch him. Post-timeskip on Onigashima, Apoo was able to injure both Monkey D. Luffy and Roronoa Zoro in succession, leaving the former briefly unconscious from a single attack, by capitalizing on their lack of understanding (and knowing how to guard against) his powers. In general, Apoo has been seen effectively holding his own against other members of the Worst Generation, even with them knowing how to evade his powers. Though he is shown to have a strong preference for fighting at a medium-to-long distance using his "Fighting Music", Apoo has some competence in close-quarters combat, specifically while wielding his pair of tonfas, and is strong enough to parry attacks from two physically mighty foes at once. He could even trade blows with X Drake while the latter was in his human-allosaurus hybrid form. Otherwise, Apoo has displayed impressive agility and acrobatic jumping skills as well as notable durability. He retained consciousness after being kicked down into a multistoried concrete building with enough force to make it collapse and recovered quickly from getting crushed by a palm strike from Kid's giant arm of scrap metal (and, while somewhat injured by the latter, swiftly responded with an attack of his own). Apoo also took a powerful surprise attack from an Ittoryu-using Zoro, which seemed to cut rather deep into his chest, and remained not only conscious but still able to fight.
