Stain (voiced in Japanese by Go Inoue and in English by Robert McCollum) is one of the initial antagonists in the series My Hero Academia/Boku no Hero Academia.

He is a villain known as the Hero Killer, and one of the main antagonists early on in the series, focusing on Iida's part of the story.

Stain has extremely spiky and messy hair, and tiny red eyes that are framed by a tattered cream mask. He wears a thick red headband, a tattered red scarf, a black and grey tank top/vest combo, black pants, and a large variety of holsters, with spiked boots with knee guards, black bracers, a tan belt with a holster, and cream arm wraps. Also several blades.