Iwao Oguro, once known by the Pro Hero names O'Clock in Japan and Hyper Quadfist in China, now goes by the moniker Knuckleduster in the My Hero Academia companion manga Vigilantes. Knuckleduster is a Quirkless vigilante.  Even since All for One stole Overclock, Iwao continues his fight justice and protects local neighborhoods by challenging gangs and small-time criminals many Pro Heroes won't take the time to stop.  Knuckleduster wears fingerless gloves, a green trench coat, and a half-face mask to conceal his identity.

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