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Gasmask Cowboy (ガスマスクカウボーイ, Gasumasuku Kaubōi) is the C-Class Rank 141 professional hero for the Hero Association.


Gasmask Cowboy is a man of average height, wearing a cowboy costume with a gasmask over his face.


Hero Association SagaEdit

Rumored Monster ArcEdit

Gasmask Cowboy converses with several other heroes about the rumored monster.[2] Gasmask Cowboy and many other heroes decided to head to Z-City to investigate the rumored monster after it defeated Golden Ball and Spring Mustachio, but he came to the scene after it was already beaten by Saitama.[3][4]

Sea Monster ArcEdit

Gasmask Cowboy, along with other C-Class heroes, meets Mumen Rider, who was heading towards J-City. He warned Mumen Rider that the monster is too strong for C-Class heroes.[5]

Appearances in Other MediaEdit


Pork Cutlet BowlEdit

Gasmask Cowboy 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.[6]


Gasmask Cowboy is one of the contestants of the Hero Costume Contest under the entry number 15. When Game-Berus attacked the stadium, he tried to defeat the monster to gain extra points.[7]

Abilities and PowersEdit

Like most C-Class heroes, Gasmask Cowboy seems to prefer to combine strength in emergencies, rather than fight alone, as most of the time he is seen with other C-Class heroes.



Lasso: He is seen wielding a lasso and is presumably skilled in using it. He uses rope to capture Mysterious Beings.[1]

Cowboy gun: He is also has a holster on the left side of his belt with a revolver gun indicating that he uses a gun to shoot Mysterious Beings.[1]


  • Gasmask Cowboy raises skunks.[1]


  1. 1.0 1.1 1.2 1.3 1.4 One-Punch Man Encyclopedia; One-Punch Man: Hero Perfection, page 94
  2. One-Punch Man Manga; Chapter 20, page 29
  3. One-Punch Man Manga; Chapter 20, page 35
  4. One-Punch Man Anime; Episode 6
  5. One-Punch Man Anime; Episode 8
  6. One-Punch Man Omake; Pork Cutlet Bowl
  7. One-Punch Man Omake; Taste


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