Gasmask Cowboy (ガスマスクカウボーイ, Gasumasuku Kaubōi) is a 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 meet Mumen Rider, who was heading towards J-City. He warned Mumen Rider that the monster threat is demon and that they cannot fight it.[5]

Appearances in Other MediaEdit


Pork Cutlet BowlEdit

Gasmask Cowboy was one of the many heroes which tried to defeat the monster that was devastating a police station in order to get a credits, since it was an important emergency. However, he arrives at the scene when 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 point.[7]

Abilities and PowersEdit

Like most C-Class heroes, Gasmask Cowboy seems to prefer to combine strength against emergencies, rather then fight them alone, as he was seen most of the time with other C-Class heroes.


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

Revolver: He has a holster on his left side of his belt with a gun presumably a revolver.


Gasmask Cowboy raises skunks.[1]


  1. 1.0 1.1 1.2 1.3 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