One-Punch Man Wiki
I have the hardest horn in the world! It is absolutely unbreakable!
— Unihorn[1]

Unihorn (イッカク, Ikkaku) was a Demon-level monster and a member of the Monster Association. He was one of the monsters sent by Gyoro Gyoro to investigate an unknown intruder, along with Super Mouse and Showerhead.[2]. He was killed by Overgrown Rover.[3]


Unihorn was a humanoid creature with a large horn as a forehead. He had eyes all over his body; malformed teeth, misaligned jaws and no apparent nose or ears. In his transformed state, Unihorn took on the shape of a long lance and his mouth moved to the center of the shaft. Eyes appeared on the linings of his body in both states.


As a monster, he naturally seemed to be confident in himself, proclaiming his horn as "the hardest in the world," and "unbreakable." Unlike many other monsters in the association, he was willing to work alongside other monsters to fight other opponents.


Human Monster Saga[]

Monster Association Arc[]

Garou counters Unihorn's spinning attack

Unihorn appears alongside his partners, Super Mouse and Showerhead, to confront Garou. Unihorn says Garou is full of himself, and proceeds to attack him first, swinging his body around like a giant buzzsaw. However, Garou easily anticipates his move and sends him crashing to the wall. While Super Mouse and Showerhead distracted Garou, Unihorn

Unihorn is defeated

transforms into his killer form. Super Mouse picks him up for their combo move, the Demon Trinity Bursting Speed Thrust. Unfortunately for them, Garou had already experienced a similar attack against Stinger and deflects it. Alas, Garou forgot that Overgrown Rover was still standing behind them, and the attack caused him to deem all of the people in the room as threats. Overgrown Rover tosses back Unihorn, who, despite boasting of an "unbreakable horn", is broken. He is then vaporized by Rover's energy blast alongside his partners.

Abilities and Powers[]

As a Demon-level threat, Unihorn was a very powerful monster. He managed to survive an attack from an evolving Garou. However, against Dragon-level monsters, he was utterly helpless, as he was effortlessly broken apart by Overgrown Rover.

Physical Abilities[]

Enhanced Strength: Being a Demon-level mysterious being, it can be presumed that Unihorn had impressive physical strength.

Enhanced Speed: Unihorn was rather fast, being fast enough to spin himself around at intense speeds, appearing as a giant circular saw.

Enhanced Durability: Unihorn proclaimed to have an "unbreakable horn", and was also strong enough to take a kick from Garou unharmed. However, he was easily defeated and mangled by Overgrown Rover, while in his transformed state.

Unihorn in his transformed state

Killer Form (必殺形態, Hissatsu Keitai; Viz: Killingest Form): Unihorn could transform his humanoid body into a sharpened spear. While in this state he lost his arms and legs but had a longer reach. This form was used in a combination attack with Showerhead and Super Mouse who shot him at a high speed.

Fighting Style[]

Slice and Pierce: Unihorn's attack revolved around stabbing and cutting his opponents.

  • Combination Attack: Demon Trinity (三鬼一体, Sanki-itsutai; Viz: Triple Demon)
    • Bursting Speed Thrust (爆速刺し, Bakusoku-zashi; Viz: High Speed Shish Kebab): The attack utilized the powers of Unihorn, Showerhead, and Super Mouse. Super Mouse launches a transformed Unihorn forward as Showerhead continues to propel him with Jetstream. Garou found it slow and compared it to Stinger's attack,[4] though the attack was powerful enough to bother Overgrown Rover.


Unihorn's name and his transformation are a reference to the narwhal, a cetacean with a very long horn-shaped tusk. In fact, the Japanese name イッカク (Ikkaku) literally means "one horn", but generally means "narwhal".

Major Battles[]

Participants Chapter(s) Episode(s) Result
Unihorn, Showerhead and Super Mouse vs. Garou 93 None Interrupted by Overgrown Rover


  1. One-Punch Man Manga; Chapter 93
  2. One-Punch Man Manga; Chapter 93, page 8
  3. One-Punch Man Manga; Chapter 93
  4. One-Punch Man Manga; Chapter 93, page 21-23


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 *