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Demolition John (破壊屋ジョン, Hakai-ya Jon; Viz: Destroyer John)[1] was a prisoner of Smelly Lid Prison. It can be assumed that he was turned into a monster by Nyan and killed by Puri-Puri Prisoner.


Demolition John was a muscular man with a thick mustache and goatee. His head was bald with only three stripes of hair going down. While in prison, he wore the standard striped prisoner uniform.


Human Monster Saga[]

Super Fight Arc[]

When Nyan breaks into Smelly Lid Prison in search of Puri-Puri Prisoner, Demolition John and the other prisoners question the monster's motives.[2]

Appearances in Other Media[]



Demolition John greets Speed-o'-Sound Sonic by trying to make sure Sonic knows his place. Sonic disregards him completely, prompting him to punch Sonic in the face. While gleefully stating that he never holds back, he noticed he punched a lead ball instead, breaking his hand in the process.

Abilities and Powers[]

The prisoners confront Nyan

Demolition John was the strongest inmate of Smelly Lid Prison. He was also the boss of the prison's muscle group.[1]

Physical Abilities[]

Enhanced Strength: Demolition John possessed rather impressive physical strength. He has targeted countless prisoners and left them irrevocably crippled.[1]

Fighting style[]

Skilled hand-to-hand combatant: Demolition John was quite skilled in unarmed combat.


  1. 1.0 1.1 1.2 1.3 1.4 One-Punch Man Encyclopedia; One-Punch Man: Hero Perfection, page 184
  2. One-Punch Man Manga; Chapter 66, page 15


S-Class Gale WindHellfire FlameSpeed-o'-Sound Sonic
B-Class Hyaha Axe
Ex-Villains Dr. GenusHammerheadMen's Esthetician Man
Undetermined Class