Mr. Oguro (雄黒 Oguro?)[2] is the vigilante known as Knuckleduster (ナックルダスター Nakkurudasutā?). He was formerly the Pro Hero known as High-Speed Hero: O'Clock ("超速ヒーロー" オクロック "Chōsoku Hīrō" Okurokku?) or "Hyper Quadfist".[3]


Knuckleduster is a towering, heavily muscled man. The top half of his face is always covered by his mask, so what’s visible is but his heavy stubble and part of a scar running diagonally down his left cheek.

His costume consists of a simple wrap-around mask tied over the top of his head, a tight-fitting dark shirt, jeans, boots and a long trench coat. On his hands he wears a pair of gloves topped with a pair of brass knuckles, or knuckledusters, from which he derives his name.

As O'Clock he wore a full body suit and a case that covered his eyes and half of his face. He also wore gloves and boots, and his suit had several lines around the arms, legs and torso. On his shoulders he had what appeared to be his symbol.


Despite his intimidating appearance, Knuckleduster is actually a very caring and good-hearted individual with a drive to do the right thing. Despite having no government-issued hero license, he still puts on his costume and goes out every night to fight street-level criminals and local gangs to keep his neighborhood safe from crimes most "heroes" will not bother with.

He appears to enjoy a challenge and becomes very upset or frustrated whenever there are no particularly strong Villains to fight. when a fight is too easy, he quickly becomes depressed. He also prefers to punch first and ask questions later, as he is willing to beat up people he deems to look suspicious on the slim chance that they may be villains or users of the Trigger drug. His attitude extends that he was willing to attack a defenseless young-appearing woman who had a Hero Provisional license, and felt little to no guilt or worry about doing so, despite the fact that he could have been registered as a Villain if the misunderstanding continued, showing a more aloof and careless side to his personality.

Despite having no Quirk, he shows no resentment towards people who do and shows no fear towards Villains who have powerful Quirks. In fact, he seems to enjoy fighting against particularly strong people who have powerful Quirks. This seems to be one of the main joys of his life, as he becomes invigorated whenever he gets to fight a strong opponent. He is even willing to fight against professional Heroes if the situation calls for it. Despite this reckless streak, he does genuinely admire Heroes for the work they do, and it is hinted that he would like to be a Hero himself, despite not having a Quirk, hence his Vigilante work.


Overall Abilities: Knuckleduster is Quirkless, proven when Shota Aizawa tried to erase his Quirk only to have no effect on Knuckleduster. Despite being Quirkless, Knuckleduster is incredibly tough in strength and skill as he was able to fight on even terms with Shota. He was also able to single-handedly defeat Stendhal with a single blow.

Keen Intellect: Despite appearing to be a mere brawler, Knuckleduster has great intuition and tactical knowledge. When fighting Trigger enhanced villains he is able to work out how their Quirk works and the best way to counter whilst fighting them,[4] quickly understood Stendhal's way of fighting and his state of mind,[5] and also preemptively formulated a battle plan that would allow him to defeat Kuin Hachisuka whilst also saving his daughter's life.[6]

Hand to Hand Combat: Knuckleduster appears to be skilled in hand-to-hand combat, utilizing brass knuckles as his weapon of choice. His skill with his fists was great enough to overcome Chizome's skill with the sword, landing a heavy blow before Chizome could scratch him.

Enhanced Durability: Despite being Quirkless, Knuckleduster is very sturdy, standing up even when he receives blows from physical enhancement Quirks.

Enhanced Strength: Knuckleduster's strength is surprisingly high, and he is sometimes mistaken for having a strength-enhancing Quirk. He was capable of going fist to fist with a tremendously physically powerful and fast moving Trigger enhanced man and knock him out.[7]


Acceleration (加速 Kasoku?): The Quirk allows him to accelerate to extreme speeds to the point that to him it looks like nothing is moving. He is fast enough to land four blows on his foes in an instant. The quirk does have a cool down time after using it and can only be used for a few seconds.[8]

Heightened Focus: Thanks to his Quirk, O'Clock could see, hear and think at hyper speed.[8]


  • Brass knuckles
  • Grappling Hook: Knuckleduster has been seen swinging from buildings with a grappling hook.
  • Painkillers: Used to tone down pain. Bought regularly from Giran.[6]
  • Taser knuckle: A Taser weapon with a built in defibrillator. Bought off Giran.[6]
  • Pheromone Cocktail: An explosive cocktail made to draw in bees and then explode. Made with items obtained from Giran.[6]

Battles & Events

Vigilante - My Hero Academia: Illegals

  • Knuckleduster & Koichi Haimawari vs. Soga Kugizaki, Moyuru Tochi & Raputo Tokage
  • Knuckleduster vs. Shota Aizawa
  • Knuckleduster, Koichi Haimawari, Kazuho Haneyama & Shota Aizawa vs. Mario Kugutsu, Soga Kugizaki, Moyuru Tochi & Raputo Tokage
  • Knuckleduster & Koichi Haimawari vs. Akira Iwako
  • Knuckleduster, Koichi Haimawari & Kazuho Haneyama vs. Teruo Unagisawa
  • Knuckleduster vs. Power Amplification Impromptu Villain
  • Knuckleduster vs. Stendhal
  • Knuclkeduster vs. Kuin Hachisuka/Tamao Oguro


  • Knuckleduster's other name, Oguro, means,"雄"(lit.male) and "黒"(, and his other name Takeshi, means take "武"(lit.warrior, military, chivalry, arms) and shi "司" (lit.boss). His last name, kuro, share the same kanji "黒"( and iwa "岩" (lit.rock).
  • His personality also bears a resemblance to Batman, a hero in American comics who is also extremely skilled at hand-to-hand combat that has no real powers.
    • He is also very similar the Wildcat a.k.a Ted Grant, a hero who is known for his aggressive fighting style and personality.
    • In Marvel Comics, he could be considered a hero close to Daredevil or Wolverine.
  • Knuckleduster's favorite things are cigarettes and beer.
  • His vigilante name is another name for the brass knuckles that form apart of his costume.


  1. Vigilante - My Hero Academia: Illegals Manga: Chapter 16 (p. 13).
  2. 2.0 2.1 Vigilante - My Hero Academia: Illegals Manga: Chapter 19 (pp. 8-11).
  3. Vigilante - My Hero Academia: Illegals Manga: Chapter 44.
  4. Vigilante - My Hero Academia: Illegals Manga: Chapter 6.
  5. Vigilante - My Hero Academia: Illegals Manga: Chapter 11.
  6. 6.0 6.1 6.2 6.3 Vigilante - My Hero Academia: Illegals Manga: Chapter 26.
  7. Vigilante - My Hero Academia: Illegals Manga: Chapter 6.
  8. 8.0 8.1

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