Hero Killer Stain was one of the most memorable villains inMy Hero Academia thus far. Existing entirely outside of All For One's increasingly complex plans, this bloodthirsty villain was completely in pursuit of his own goals and wanted to take down the current hero society. He was so influential, in fact, that the video recorded of him during his capture not only inspired the League of Villains to grow stronger with new recruits like Himiko Toga and Dabi, but his videos are still dominating the Internet months after his initial capture.