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Ugmons (ブサモン, Busamon) are an unusual type of Mysterious Beings created from ugly humans.


Ugmons are formerly ugly humans, who have become monsters due to bullying, or from being turned down by the opposite sex. The feelings of jealousy or inferiority turn into hatred, covering their hearts with darkness dyed with evil. Their strength after turning into monsters is influenced by the hideousness of their hearts.[1]

They seem to be common knowledge as the kids bullying Tareo mention their existence.[2]

Warning The following section contains Original Webcomic spoilers. Expand to see spoiler content.

They are able to grow in size and rearrange their body parts.

Known UgmonsEdit

Name Affiliation Status
Fuhrer UglyMonster AssociationAlive


  1. One-Punch Man Manga; Chapter 113, page 27-28
  2. One-Punch Man Manga; Chapter 87, page 24


Mysterious Beings
Unaffiliated Crablante Vaccine Man Marugori Subterranean King  (Subterranean People) • Kombu Infinity170,000-Year Magicicada Nymph 170,000-Year Magicicada Adult Demonic Fan Pesky ClownPiggy Bancon Deep Sea King  (Seafolk) • Personification Of A Light Pull CordSurprise-Attack Plum Grizzly NyahSky King  (Skyfolk) • Game-Berus Octopus Claw Man Suppon Giant Crow Tongue StretcherEagle Hawk Falcon Kite Lord Great White Jumping Spider Giant Snowman Himaaku Hotdog GigakiganDeloreanThree Eyed Ghost Scaledon Enamel Pot Bellee Man-Eating Capybara Twin-Headed Tsuchinoko Kenzan Rat Forest King  (Forest Tribe) • Withered Sprout Macho Daikon Black Roast Alien SeerAutumn Phantom Red Golden-ringed Dragonfly
Dark Matter Thieves Boros Geryuganshoop Melzargard Groribas Dark Matter Gunner 
The Organization G4 G5 
House of Evolution Carnage Kabuto Beast King Armored GorillaKamakyuri Ground Dragon Frog Man Slugerous Mosquito Girl 
Anime-Only Mysterious Beings Super Custom YO649Z Mk. II Ancient King  (Terror Lizard Clan) • Fish of DarknessPluton Men's Esthetician Man *
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