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Bone (骨, Hone)[1] is the B-Class Rank 77 professional hero for the Hero Association.


Bone is a muscular hero fully dressed in a skin-tight skeleton costume.


A typical hero of the Hero Association, Bone is a proud and glory-craving hero who fights monsters to gain fame. This leads him to fight monsters stronger than himself. He wants his achievements to be told to the coming generations.


Human Monster SagaEdit

Super Fight ArcEdit

Bone, along with Butterfly DX and Death Gatling, was trying to stop Hundred-Eyes Octopus in I-City.[2] He narrowly manages to rescue Red Muffler from Hundred-Eyes Octopus. After strengthening his bones by drinking milk, he attempts to fight the monster but is instantly defeated, and all his bones are crushed.[3]

He was later saved by Chain'n'toad when Tatsumaki drops the monster corpse on him and other A-class heroes.[4]

Appearances in Other MediaEdit


Pork Cutlet BowlEdit

Bone was one of the heroes who are called to fight the monster assaulting the police station. However, by the time he arrives at the scene, Saitama had already defeated the monster.[5]

Abilities and PowersEdit

As a B-Class hero, it can be assumed that Bone is a fairly skilled combatant, though his rank implies he isn't very strong by B-Class standards.

Physical AbilitiesEdit

Bone Milk

Bone drinking milk to strengthen up his bones.

High Bone Density: Bone was born with a highly dense bone structure, which makes his body as tough as armor. Furthermore, for a short period of time, he can also increase his bone density by four times, by drinking milk or consuming food with high amounts of calcium.[6] However, all of these are not enough to withstand a strike from the tentacle of the Hundred-Eyes Octopus, which breaks every single bone in his body.[7]

Enhanced Speed and Reflexes: Bone was able to save Red Muffler from a bus thrown by the Hundred-Eyes Octopus.[8]

Enhanced Endurance: Bone was able to survive an attack from the Hundred-Eyes Octopus, a blow that broke every bone in his body.

Major BattlesEdit

Participants Chapter(s) Episode(s) Result
Bone, Butterfly DX and Death Gatling vs. Hundred-Eyes Octopus 61, 68 17 Loss


  • Bone happens to be mostly based Skullomania from Arika's fighting game series, such as Capcom's Street Fighter EX series and Arika's own Fighting EX Layer.
  • Bone does not appear in the anime adaptation. Instead Butterfly DX and Death Gatling face Hundred Eyes Octopus all by themselves, until Flashy Flash arrives.
  • Bone appeared in the Webcomic, but under the slightly changed name Steel Bone (鉄骨) and with a different rank (B Rank 57). It's unclear why this is, but it could possibly mean that he was promoted to this rank after fighting Hundred-Eyes Octopus and given a new name as well. 


  1. 1.0 1.1 1.2 One-Punch Man Encyclopedia; One-Punch Man: Hero Perfection, page 94
  2. One-Punch Man Manga; Chapter 61, page 23-25
  3. One-Punch Man Manga; Chapter 68, page 4-8
  4. One-Punch Man Manga; Chapter 68, page 25-34
  5. One-Punch Man Manga; Pork Cutlet Bowl
  6. One-Punch Man Manga; Chapter 68, page 7
  7. One-Punch Man Manga; Chapter 68, page 8
  8. One-Punch Man Manga; Chapter 68, page 4


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