Demolition John (破壊屋ジョン, Hakai-ya Jon; Viz: Destroyer John)[1] is a prisoner of the Smelly Lid Prison.


Demolition John is a muscular man with a thick mustache and goatee. His head is bald with only three stripes of hair going down. He wears the standard striped, prisoner uniform.


Human Monster SagaEdit

Super Fight ArcEdit

A cat-like monster broke into Smelly Lid Prison searching for Puri-puri Prisoner. Demolition John and the other prisoners question the monsters motives.[2]

Appearances in Other MediaEdit



Demolition John greets Speed-o'-Sound Sonic by trying to make sure Sonic knows his place. Sonic disregarded 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.[3]


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