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


Bone is a muscular hero dressed in a skin-tight, full-body skeleton costume.


A typical hero of the Hero Association, Bone is a proud, glory-craving hero who fights Mysterious Beings to gain fame. 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, attempts to stop Hundred-Eyes Octopus in I-City.[2] He narrowly manages to rescue Red Muffler from the monster. 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's corpse on him and other A-Class heroes.[4]

Original WebcomicEdit

Warning Expand the following section to see Original Webcomic information. Beware of spoilers.

Ninjas ArcEdit

Bone, along with Heavy Kong and Peach Terry, is fighting the Internet Surfers. They are easily defeated, but they are saved by Sonic distracting the Mysterious Beings.

Appearances in Other MediaEdit


Pork Cutlet BowlEdit

Bone was among the many heroes summoned by McCoy to combat the monster that was devastating the Z-City police station. He arrives at the scene late, after Saitama has already killed the monster.

Abilities and PowersEdit

As a B-Class hero, it can be assumed that Bone is a fairly skilled combatant, though he is one of the lower-ranked heroes in B-Class implying he isn't very strong by the 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 further increase his bone density by drinking milk or consuming food with high amounts of calcium.[5] However, all of these are still not enough to withstand a strike from a demon level monster, which shattered every single bone in his body.[6]

Enhanced Speed and Reflexes: Bone was able to save Red Muffler from a bus thrown by the Hundred-Eyes Octopus.[7]

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 appears in the Webcomic under a slightly changed name, being called Iron 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. 


  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; Chapter 68, page 7
  6. One-Punch Man Manga; Chapter 68, page 8
  7. One-Punch Man Manga; Chapter 68, page 4


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