Blackbelt's hands move faster than sight can follow. Fast Fist lets him land as many as a hundred strikes inside a single second, which he spends hammering at the area around a pressure point until he finds it and drops his target where they stand.
Fast Fist, romanized as Sokuken, is the close-range Emitter Quirk belonging to the Pro Hero Blackbelt. It originates in Chapter 20 of My Hero Academia: Team-Up Missions.
The power drives the hands, at minimum, to extraordinary speed, enough for as many as a hundred blows inside less than a second.
How far the control and range actually extend has not been made clear, though the effect seems confined to the arms and hands. Blackbelt covers ground at an ordinary running pace when hurrying to a crime scene, which suggests his legs draw no benefit from it.
Blackbelt is the sole known wielder. His signature application is to batter away near a pressure point over and over until one of the blows finally connects with it, which knocks the target out on the spot. The barrage happens so quickly that an observer watching with the naked eye sees nothing more than a single chopping motion.

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Fast Fist is a close-range Emitter Quirk belonging to the Pro Hero Blackbelt that lets him throw punches at extraordinary speed, as many as a hundred strikes in under a second.
The Pro Hero Blackbelt is the only known user of the Fast Fist Quirk.
Blackbelt repeatedly strikes near a pressure point until one blow connects with it, instantly knocking out the target, with the barrage moving so fast it looks like a single motion to onlookers.
No, Fast Fist appears to affect only Blackbelt's arms and hands, since he moves at an ordinary running pace when responding to a crime scene.
Fast Fist debuted in Chapter 20 of the spin-off manga My Hero Academia: Team-Up Missions.
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