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Demolition John (破壊屋ジョン, Hakai-ya Jon; Viz: Destroyer John)[1] was an A-Class prisoner. He 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.


Demolition John used to be a traveling circus strongman whose parade number was to lift a 2,400 lbs bull over his head, However, his income was lousy.

One day the circus got a rare blue tiger. John had previously heard that a corrupt museum director was prepared to pay 2 million yen for such a tiger, so later that night he snuck to the tiger's cage, bent the steel bars and snapped the tiger's head. He got busted shortly afterward and went berserk around the circus until was stopped by two A-Class heroes.


Human Monster SagaEdit

Super Fight ArcEdit

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 MediaEdit



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 PowersEdit

Prisoners prepare to fight Nyan

The prisoners confront Nyan

Demolition John was an A-Class criminal and one of the strongest inmates of Smelly Lid Prison. He was also the boss of the prison's muscle group.[1]

Physical AbilitiesEdit

Enhanced Strength: Demolition John possessed rather impressive physical strength, being able to lift a 2400 lbs bull, bend steel bars and snap the neck of a tiger.

Fighting styleEdit

Hand-to-and combatant: Demolition John was quite skilled in unarmed combat, capable of holding his own against two A-Class heroes for a short time.


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


S-Class Gale WindGarouHellfire FlameSpeed-o'-Sound Sonic
A-Class Bull-BullSerial Bomber
B-Class Hyaha Axe
C-Class BaneroDon PacinoPacino Family
Ex-Villains Dr. GenusHammerheadMen's Esthetician Man
Undetermined Class AburabozuBase BBuriguraChimagusaCoalition of AssassinsCow's StomachDemolition JohnDevil StormFukegaoHaroldParadisersSmelly Lid Old ManSpecial Moves Mile
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