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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 gas mask over his face.


Hero Association Saga[]

Rumored Monster Arc[]

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 Arc[]

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 Media[]


Pork Cutlet Bowl[]

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 entry number 15. When Game-Berus attacked the stadium, he tried to defeat the monster to gain extra points.[7]

Abilities and Powers[]

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.

Marksmanship: Gasmask Cowboy is seen with a revolver, indicating he may have some proficiency in firearms.

Gasmask Cowboy's lasso.


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

Revolver: He is also has a holster on the left side of his belt with a revolver 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 One-Punch Man Encyclopedia; One-Punch Man: Hero Encyclopedia, 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


Hero Association
S-Class 1. Blast • 2. Tornado of Terror/Tatsumaki • 3. Silver Fang/Bang • 4. Atomic Samurai/Kamikaze • 5. Child Emperor • 6. Metal Knight/Bofoi • 7. King • 8. Zombieman • 9. Drive Knight • 10. Pig God • 11. Superalloy Darkshine • 12. Watchdog Man • 13. Flashy Flash • 14. Demon Cyborg/Genos • 15. Metal Bat/Bad • 16. Tanktop Master (Tank Topper Army) • 17. Puri-Puri Prisoner
B-Class 1. Blizzard of Hell/Fubuki (The Blizzard Group) • 2. Eyelashes • 3. Mountain Ape • 6. Wild Horn • 7. Caped Baldy/Saitama • 20. Glasses • 25. Pink Hornet • 29. Double Hole • 39. Smell Master • 39. Reclusamurai • 43. Gun Gun • 49. Butcher • 50. Jet Nice Guy • 60. Needle Star • 65. Piko • 69. Crying Man • 70. Trap Tengu • 71. Captain Mizuki/Mizuki • 74. Lily of the Three Section Staff/Lily • 77. Bone • 81. Tanktop Black Hole • 93. Mushroom • 99. ShooterDarkness BladePineapple
Undetermined Class GunmaTanktop GirlTanktop RockabillyTanktop RacerTanktop Al DenteTanktop SwimmerTanktop JungleTanktop MaskTanktop HatterTanktop DoctorPandaman
Staff Members AgoniBushoC Branch OperatorConsole OperatorExmaGuichesJinzurenMain Branch OperatorMcCoyNarinkiSekingarShelter Nr. 7 GirlSitchSome Important GuySpecial Committee GirlZ Branch Committee GirlZ Branch OperatorZeimeet