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Pesky Clown (嫌なピエロ, Iya-na Piero) is a Mysterious Being.


Pesky Clown is a stereotypical clown with red face paint over his eyes, nose and mouth with white face paint over the rest of his face. His sleeves and collar puff out widely. His shirt is patterned in many bow ties with a polka dot pattern on the arms. The monster's pants are tucked into his spiky pointed boots. Pesky Clown carries balloons shaped like animal's heads and a large mallet. He increases in size and becomes more monstrous as he gets stronger.


Pesky Clown enjoys attention and is sadistic.


Unnamed SagaEdit

Supreme Hero ArcEdit

Pesky Clown appears at a carnival and terrorizes the people. He kills several guards who try to stop him before Sweet Mask confronts him. At first, Sweet Mask overwhelms him, and he loses all of his balloons. However, spectators gathered around the fight give him attention, which significantly increases his power. He thrashes Sweet Mask around and punches him into the Ferris wheel, forcing the hero to monsterize.

Abilities and PowersEdit

Although Pesky Clown is initially classified as a Wolf-level threat, he transforms several times during his fight with Sweet Mask, eventually gaining enough strength to make the hero struggle. Sweet Mask estimates his current threat level to be Dragon. He is, notably, the only monster thus far to force Sweet Mask to use his monster form.

Immense Strength: Pesky Clown boasts very impressive strength. Although initially unable to hold his own against Sweet Mask, his strength eventually grows to the point that he is able to easily pummel Sweet Mask, and the hero proclaims that he's too strong to defeat while in his human form. He also punched Sweet Mask hard enough to demolish a Ferris wheel.

Immense Speed and Reflexes: Pesky Clown is exceptionally fast. Initially unable to react to any of Sweet Mask's attacks, as he grows, he manages to block one of the hero's attacks with his hammer and eventually catch Sweet Mask by surprise. He becomes capable of trading blows with Sweet Mask.

Immense Durability: Pesky Clown is extremely resilient already being bullet proof after his recent change. Initially, his head and neck had been demolished by singular nonchalant strikes to his frame. As he grows, his durability increases to the point of being able to withstand Sweet Mask's blows with no apparent damage.

Transformation: Pesky Clown has the ability to transform in order to increase his power. He draws power from the attention he receives; the more spectators there are, the stronger he grows. This allows him to grow to the point that he's able to overpower Sweet Mask, the top-ranking A-Class hero with S-Class abilities, and cause the hero to proclaim him too strong to defeat while in his human form. 

Fighting StyleEdit

Hand-To-Hand Combatant: Pesky Clown lacks a refined fighting style, but he was skilled enough to evenly exchange blows with Sweet Mask and eventually overpower him. Adaptation: The longer he fights, and against a more capable opponent than himself. The more Pesky Clown adjusts and evolves in order to match them. Sweet Mask calls such a monster as a "Rapid Growing" type.

Miscellaneous AbilitiesEdit

Damage Shift: By unknown means, Pesky Clown has the ability to transfer damage he takes to his balloons. Once a balloon reaches its damage threshold, it pops.


  • Mallet: Pesky Clown has a large mallet that he uses to attack and block with. He uses it to great effect.
  • Balloons: Pesky Clown had three balloons that allowed him to sustain damage without dying. When a balloon's damage threshold was reached, it popped, and he restored his original state.[4] All three balloons were popped by Sweet Mask.


  1. One-Punch Man Webcomic; Chapter 121, page 22
  2. One-Punch Man Webcomic; Chapter 121, page 16
  3. One-Punch Man Webcomic; Chapter 121
  4. One-Punch Man Webcomic; Chapter 121, page 3, page 12


Mysterious Beings
Unaffiliated Crablante Vaccine Man Marugori Piggy Bancon Giant Snowman Himawari Personification Of A Light Pull Cord Kombu Infinity170,000-Year Magicicada Nymph 170,000-Year Magicicada Adult Demonic Fan Delorean Alien SeerThree-Eyed Ghost Surprise-Attack Plum Tongue StretcherGiant Crow Octopus Claw Man Grizzly Nyah Suppon Gigakigan Hotdog Game-Berus Autumn Phantom Red Golden-ringed DragonflyJumping Spider Scaledon Enamel Black Roast Macho Daikon Withered Sprout Twin-Headed Tsuchinoko Man-Eating Capybara Pot Bellee Kenzan Rat Pesky Clown
Native Tribes Forest Tribe (Forest King ) • Seafolk (Deep Sea King Lord Great White Messenger of the Seafolk ) • Skyfolk (Sky King Eagle Hawk Falcon Kite ) • Subterranean People (Subterranean King ) • Terror Lizard Clan ( Ancient King )
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 Fish of DarknessPluton Men's Esthetician Man *
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