Bone

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

Appearance
He is a muscular hero that is fully dressed in a tight skeleton costume.

Personality
A typical hero of Hero Association, Bone is a proud and glory-craving hero who wants to defeat a powerful Mysterious Being to gain fame in the public. His craving for fame is so great that he wants his achievement to be told to the next generation of mankind.

Super Fight Arc
Bone, along with Butterfly DX and Death Gatling, were trying to stop Hundred-Eyes Octopus in I-City. He narrowly manages to rescue Red Muffler from Hundred-Eyes Octopus and attempts to fight the monster but his bones are instantly crushed.

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

Pork Cutlet Bowl
Bone was one of the many heroes which tried to attack the monster that was devastating a police station in order to get credit, since it was an important emergency. However, he arrives at the scene when Saitama has already killed the monster.

Abilities and Powers
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 Abilities
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 he can also increase his bone density by four times it's usual amount by drinking milk or consuming food with a high amount of calcium. 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.

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

Enhanced Endurance: Bone was able to survive every single bone in his body being shattered by Hundred-Eyes Octopus, a Demon-level monster.

Trivia

 * 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.

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Bone