All Might's debut as a hero left a huge impression on Chizome. He dreamed of becoming just like him, so he enrolled in a private hero course high school to train. But the experience crushed those dreams pretty fast. Chizome watched his classmates become heroes for the paycheck, not the calling—what he saw as fundamental decay. Disillusioned, he dropped out during his freshman year summer.
After leaving school, teenage Chizome started preaching his vision for a "Revival of Heroics" through street speeches and soapbox sermons. Nobody paid attention. Over the next decade, he came to believe that words alone wouldn't cut it—real change required action. He spent those years disciplining himself, studying killing techniques through self-training as part of his mission. Around this time his parents died, though the circumstances remain unclear.
Once he'd mastered his craft, Chizome became the Hero Killer: Stain. His "Revival of Heroics" ideology boiled down to a simple belief: true heroes don't chase money or fame. They only earn the title through ultimate self-sacrifice. Everyone else in the modern hero system? Fakes. Imposters.
Stain decided the only way to expose this rot was action. He started targeting pro heroes, killing them methodically. His plan was to keep going until society finally woke up to how broken the system was. In his mind, tearing it down was the only path to a world filled with genuinely righteous heroes.
Content compiled by AnimeList.moe from publicly available sources.
