One-Punch Man Wiki
Now the heroes who raided our hideout are as good as dead!
— Building Booper[1]

Building Booper (ビルブッパ, Birubuppa; Viz: Building Blaster) was a Demon-level Mysterious Being and a member of the Monster Association.


Building Booper was a lean detonator with arms, legs, a long electric cable as a tail, and a predatory face with one eye. The bottom of his detonator body is striped in black.


Building Booper appeared to be a sadistic monster. He destroyed buildings around him to block the escape route of the heroes who had raided the Monster Association Headquarters, stating that they would die to Orochi's tentacles.


Human Monster Saga[]

Monster Association Arc[]

Building Booper is seen in Z-City blocking the heroes' escape and supply routes on the surface by causing several buildings around the routes to collapse with explosives.[2] He presumably dies when the combined strength of Saitama, Waganma, Child Emperor and Underdog Man push the exit manhole below the two collapsed buildings, where he is standing, sending all him and the buildings flying in the air and eventually falling to the ground which seems to result in his death.[3]

Abilities and Powers[]

As a Demon-level Mysterious Being, Building Booper was likely a fairly powerful monster. He had the ability to cause buildings to collapse by blowing them up with explosives.


  1. One-Punch Man Manga; Chapter 109, page 6
  2. One-Punch Man Manga; Chapter 109, page 6
  3. One-Punch Man Manga; Chapter 109, page 8-10


Monster Association
Executives Black Sperm *Evil Natural Water *Homeless Emperor Fuhrer Ugly Gums Overgrown RoverNyan Elder Centipede Gouketsu 
Demon Awakened Cockroach Baquma Bug God Building Booper Devil Long Hair Do-S *Eyesight G5 Hundred-Eyes Octopus Vampire (Pureblood) Rafflesidon Royal Ripper Face Ripper Fist Fight Djinn Free Hugger Rhino Wrestler The Three Crows Senior Centipede Showerhead Super Mouse Unihorn The Great Food Tub 
Unknown Gyoffrey Goddess Glasses Venus Mantrap Junior Centipede Haragiri Rosie Choze Benpatsu *Hamukichi *Volten *Evil Eye Gale Hellfire Evil Eggs ManakoPlatinum Sperm Sword Devil Executioner Raptora *Reptera
Mysterious Beings
Dragon (or higher) Boros Orochi *
Demon 170,000-Year-Old Cicada Larva 170,000-Year-Old Cicada Adult Armored GorillaAwakened Cockroach Baquma Beast King Bruinado Bug God Building Booper Deep Sea King Demonic Fan Devil Long Hair *Do-S *Eyesight Face Ripper Fist Fight Djinn Free Hugger G4 G5 Game-Berus Giant Crow Grizzly Nyah Hundred-Eyes Octopus Jumping Spider Macho Daikon Mosquito Girl Rafflesidon Rhino Wrestler Royal Ripper Scaledon Senior Centipede Showerhead Sky King Subterranean King Super Mouse Surprise-Attack Plum The Great Food Tub The Three Crows Unihorn Vampire (Pureblood) 
Wolf Himawari Hotdog Messenger of the Seafolk Piggy Bancon Tongue Stretcher
Less than Wolf
Unknown Alien Seer *Ancient King Angry Grandpa Autumn Phantom Red Golden-ringed Dragonfly *Benpatsu *Choze DarkDark Matter Gunner Eagle Enamel Evil Eggs Evil Eye Evil Natural Water *Falcon Fish of DarknessGale Giant Salamander Gigakigan Goddess Glasses Gyoffrey Hamukichi *Haragiri Hawk Hellfire Junior Centipede Kite Lord Great White ManakoMen's Esthetician Man *Platinum Sperm Rosie Raptora *RepteraSage Centipede Suppon Sword Devil Executioner Venus Mantrap Volten *