Iwao Oguro

Knuckleduster is a vigilante.

Appearance
Knuckleduster is a towering, heavily muscled man. What is visible of his face under his mask reveals heavy stubble and part of a scar along his left cheek. His costume consists of a simple wrap-around mask tied over the top of head, a tight-fitting dark shirt, jeans, boots, a trench coat, and a pair of gloves topped with a pair of brass knuckles, or knuckledusters, from which he derives his name.

Personality
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" won't bother with.

Strengths and Abilities
Overall Abilities: Knuckleduster is Quirkless, proven when Shouta 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 Shouta.

Hand to Hand Combat: Knuckleduster appears to be skilled in hand to hand combat utilizing brass knuckles as his weapon of choice.

High Durability: Despite being Quirkless, KnuckleDuster is very sturdy, standing up even when he receives blows from Villains with physical enhancement Quirks.

Trivia

 * 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.