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As a frog in the well knows nothing of the depth of the ocean... the A-Class heroes know nothing of the terror of hair.
— Devil Long Hair[1]

Devil Long Hair (魔ロン毛, Maronke; Viz: Malong Hair) is a Demon-level Mysterious Being and a member of the Monster Association.


Devil Long Hair resembles a human with very long chestnut hair. His face and ears are decorated with vine-like design and his eyes are pure white. He dons a white attire with thigh-high black boots and black gloves. His jacket has many black embroilments and feathers giving him a rather flamboyant appearance.


Devil Long Hair has always been obsessed with his hair, and precisely that obsession is the reason why he became a monster. He has a very unique speech pattern, as he always speaks in idioms that he sometimes modifies to always involve hair. He carries himself with an air of aloof vagueness.

He is particularly calm and was seen speaking to lesser monsters with no difficulty restraining himself from violence, whereas other high-level monsters often began infighting or cannibalizing each other during idle moments. He is also rather prideful, seemingly surrounding himself with lesser monsters. He tends to use many metaphors to mock his opponents.


In the past, Devil Long Hair was human but monsterized after growing his hair out and obsessing over proper hair care and management.[2]


Human Monster Saga[]

Monster Association Arc[]

At the Monster Association base, he explains to a fellow member how he became a monster by grooming his hair, giving it magical properties.[2]

Devil Long Hair lies defeated on the floor after having most of his hair cut off

Later, Devil Long Hair shows up against Atomic Samurai's three disciples, Iaian, Bushidrill and Okamaitachi. Upon seeing Devil Long Hair's attractive looks, Okamaitachi is immediately infatuated with him, but tries to resist it due to such a relationship being forbidden love. Okamaitachi's resolve quickly becomes clear, and she tells Devil Long Hair that she's unable to "reciprocate his feelings". The monster tells her that this news strikes him like "a bolt from the blue". The swordsman then prepares her Air Blade, only for Devil Long Hair to block the long-range attack with his hair.[3]

Devil Long Hair scoffs, and tells them they'll drown in his hair. The monster stabs his hairs underground and all attack the swordsmen. Devil Long Hair continues these multiple attacks on the three swordsmen, but they manage to hold their own.[3] After a long fight, the three swordsmen manage to trim all the long hairs of Devil Long Hair, causing him to fall down the floor and become unconscious.[4]

Abilities and Powers[]

Devil Long Hair attacks Bushidrill, Iaian, and Okamaitachi with his hair.

Being a Demon-level monster Devil Long Hair is a very powerful monster. He easily injured a top A-Class Hero and needed three of them to take him down. Even the heroes, who had excellent teamwork, barely managed to defeat him. However, it's unclear whether his power stems entirely from his hair alone, or if he has any other extraordinary physical abilities that have yet to be revealed. His hair doubles as both his greatest strength and weakness. He is defeated after Iaian, Okamataichi, and Bushidrill chop off all his hair, making him lose all his hair manipulation abilities and he falls unconscious after the battle.

Hair Manipulation: Devil Long Hair can manipulate his hair to lengthen and move as he pleases. They are extremely durable, flexible and quick as they were able to catch Okamaitachi's Air Blades[3] and tunnel through solid ground to launch multiple attacks from unexpected directions.[3] They are also capable of binding opponents, great piercing power, and are fast enough to catch top-ranking A-Class heroes by surprise. While Devil Long Hair has some durability to his hair, they are vulnerable to attacks and can break as seen when the three disciples of Atomic Samurai cut off all his hair.

Major Battles[]

Participants Chapter(s) Episode(s) Result
Devil Long Hair vs. Iaian, Okamaitachi and Bushidrill 107, 108 None Loss


  • In the manga, a humanoid monster was seen talking to Devil Long Hair before the assault of the heroes.[2] The same monster was eventually killed by Tongara after failing a surprise attack coming from underground, where Devil Long Hair was lurking, meaning that the two were together at that time as well.[5]


  1. One-Punch Man Manga; Chapter 107, page 22-23
  2. 2.0 2.1 2.2 One-Punch Man Manga; Chapter 90, page 48
  3. 3.0 3.1 3.2 3.3 One-Punch Man Manga; Chapter 107
  4. One-Punch Man Manga; Chapter 108
  5. One-Punch Man Manga; Chapter 107, page 9-10


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 *