Also known as Hero Killer: Stain (ヒーロー殺ごろしステイン, Hīrō Goroshi Sutein?), and formerly the vigilante Stendhal (スタンダール, Sutandāru?), is a villain and ex-vigilante that is notorious for having killed many Pro Heroes. Stain does not wish to kill those who are not targets for his own cause. He dislikes needless bloodshed, thus explaining why he came to blows with Tomura Shigaraki. He is reluctant to attack Tenya Ida before the hero-in-training provokes him.