Ruuki

Ruuki is a reverse shapeshifter played by Cor.

Information
During the Foreshadowing Arc, Denki calls up Ruuki to help disguise Shouto as Mei in order to get Mei's suspicious mother out of the picture. Present Mic is upset at first, saying that Ruuki had been a villain in the past, but Ruuki assures everyone that is no longer the case. His quirk allows him to shapeshift other people.

He reappears in the Capri Sun arc to help infiltrate the villain base to get the extractis crepundis antidote for Dabi.

Backstory
According to Present Mic, Ruuki was a villain at some point. He also used to babysit for Denki Kaminari.