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The Oto Oto no Mi is a Paramecia-type Devil Fruit which allows the user to transform parts of their body into musical instruments and play music with a variety of destructive effects. It was eaten by Scratchmen Apoo.
Oto (音,Oto?) means "sound". It is the first kanji in the Japanese word for "music", ongaku (音楽,ongaku?).
Strengths and Weaknesses
By transforming their body parts into instruments (such as turning teeth into piano keys or an arm into a saxophone) and playing specific notes and tunes, the user can release music that causes damaging effects to their opponents, the type of damage being determined by what they play. There is a wide range of attacks the user can perform, from physical strikes like punches and slashes (which can dismember victims) to elemental attacks like explosions. Since the attacks come from invisible sound waves which travel at very quick speeds, it can be very difficult to recognize and dodge an attack. Even AdmiralKizaru, whose Devil Fruit power allows him to move at the speed of light, was caught off-guard by the fruit's attacks. The user can form instruments in seconds. Anyone who is within eyeshot and earshot of Apoo will be affected by the music; he can specifically choose which targets to affect by simply looking at them.
The fruit's powers only work if the user's targets can actually hear the music; if they cover their ears, then the music will be harmless. Additionally, Apoo will be unable to attack anything he cannot see, so if an opponent is fast enough to elude his eyesight, they will stay out of harm's way. Since Apoo played specific tunes for each attack, it is likely that the user must be well-versed in music knowledge and have the ability to play a large variety of instruments in all the major classes: wind, percussion, and string. While some of the user's attacks can be performed quickly, others appear to require a longer playing period. The attacks do not have any special impact on Logia users, who can easily reform their bodies after being struck.
Other than that, the user is also affected by the standard Devil Fruit weaknesses.
Apoo uses the fruit's abilities in combat. Rather than directly confronting his opponents, he starts playing his music, which he calls Tatakau Music (戦う音楽,Tatakau Myūjikku?, literally meaning "Fighting Music"), while his target is focused on something else, allowing him to wound his target before they can react.
Tatakau Music: Scratch (戦う音楽 スクラッチ,Tatakau Myūjikku: Sukuratchi?, literally meaning "Fighting Music: Scratch"): Apoo turns parts of his body into various instruments and starts a dance-like musical number, over which he raps, all the while emitting musical sound to carry out his attacks. This was first seen being used against Admiral Kizaru.
Shan (斬,Shān?, literally meaning "Cut"): By turning his jaw into a cymbal and playing it by pushing down on his head, Apoo releases a sound wave that will cause his target to be cut, as if sliced by something sharp. The attack is strong enough to potentially cut off a limb and deeply gash highly durable foes. The attack was first seen being used against Admiral Kizaru. "Shan" is an onomatopoeia that symbolizes quick and silent sounds, like a slash. In the Viz Manga, this is called Slash.
Don (爆,Dōn?, literally meaning "Explosion"): By turning his chest into a drum and hitting it with his fists, Apoo releases a sound wave that will set off an explosion from seemingly the inside of his target's body. The attack was first seen used against Kizaru, who was blown to literal pieces by it, although Kizaru escaped damage courtesy of his Logia powers. Against Monkey D. Luffy, the explosion proved strong enough to momentarily knock him unconscious, with smoke escaping his mouth. In the anime when used against Kizaru, the soundwave is depicted as turning into rings of fire before the explosion occurs, as a visual effect. "Don" is an onomatopoeia that symbolizes a strong noise, like an explosion. In the Viz Manga, this is called Boom.
Bon (殴,Bon?, literally meaning "Strike"): By turning his forearm into strings and plucking them, Apoo releases a sound wave that causes the target to suffer a blunt-force impact, as if they were punched. This attack was first seen being used against Luffy, who was sent flying a short distance back by the blow, suffering a visible bruise despite being a rubber man. In the Viz Manga, this is called Bop.
Among named fruits, this one currently has the longest gap between when its power was first shown and when it was named, at 13 years and 30 days. 514 chapters were released between its usage debut and when it was named in Vivre Card.
Brook has also been shown using music-based attacks, though his techniques rely mainly on hypnotism in contrast to the supernatural attacking abilities of this fruit.