• Disillusionment: Inspired deeply by All Might as a youth, Stain enrolled in a private hero academy. He dropped out after realizing most students and heroes cared more about fame, wealth, and power than true self-sacrifice. • From Speech to Violence: He initially tried peaceful street activism to reform society, but nobody listened. Frustrated, he spent a decade training in the lethal arts of murder. • The Stendhal Persona: He operated first as a vigilante named Stendhal before a conflict with the vigilante Knuckleduster shattered his mask and his worldview, leading him to rebrand as the "Hero Killer: Stain". Quirk & Abilities • Bloodcurdle: His Quirk allows him to paralyze targets by ingesting a sample of their blood. • Paralysis Duration: The length of paralysis depends on the victim's blood type: • Type B: Longest duration (up to 8 minutes; Stain's own blood type) • Type AB: Second longest • Type A: Third longest • Type O: Most resistant / shortest duration • Combat Skills: Possesses superhuman speed, endurance, and terrifying bloodlust, paired with an arsenal of katanas, daggers, and throwing knives. Ideology • True Heroism: Stain believes All Might is the only true hero because he sacrifices himself without asking for reward. • The Purge: He kills or cripples commercialized pro-heroes to force society to rediscover the true meaning of heroism, even later providing intelligence to aid heroes in the Final War against All For One.