Strongarm

Bullet Punch is an unnamed Quirk used by Rappa.

Description
Bullet Punch appears to allow Rappa to increase the strength and the speed of his punches. When he uses his Quirk, his fingers transform into a brass-knuckle like substance on the outer side of his knuckles. He is then able to throw a huge flurry of punches that are incredible quick, and immensely powerful. This Quirk is strong enough to shatter Eijiro's Red Riot Unbreakable form with ease, as well as whittle away at Fatgum, a Pro Hero with a defensive Quirk.

However, this Quirk is unable to break Tengai's Barricade Quirk, despite it's power.