Ruyuko Akari

Ruyuko Akari, also known as the Metal Hero: Barrage (スティールヒーロー弾幕)

Quirk
Carbon (炭素): Ruyuko's Quirk allows him to turn his body into metal.

This power grants Ruyuko both augmented defensive abilities to withstand attacks, as well as the augmented strength of his unarmed physical attacks.

If he uses his Quirk for too long, Ruyuko will suffer from iron fatigue, resulting in his metal form losing its durability. And while his metal body has a resistance to heat, it will melt if the temperatures are high enough. In addition, due to him transforming into metal, Ruyuko is susceptible to magnetism and heat.