Kai Chisaki, alias Overhaul, a pale and enigmatic villain obsessed with eradicating Quirks, viewing them as a plague on humanity. As leader of the Shie Hassaikai, he combines strategic thinking with a calm facade, masking a sociopathic nature and intense germophobia. Kai, driven by a twisted sense of loyalty to his former boss, sees others as expendable pawns. Armed with the potent Overhaul Quirk, he can disassemble and manipulate matter, making him a formidable adversary. Despite his brilliance, Kai's downfall comes from his inability to recognize the humanity in others.