Kai Chisaki

Kai is a mysophobic, antisocial sociopath who is obsessed with returning the world to the way it was before the Quirk phenomenon. Kai is the head of the Shie Hassaikai, the Japanese Yakuza, and is the youngest man to reach such heights. His Quirk, overhaul, allows him to tear things apart and rebuild it to his liking as long as he can touch the object with his hands. His Quirk also works on people. Due to a combination of an old theory claiming Quirks derived from rats and his own mysophobia, Kai believes that Quirks are actually a plague on humanity, having infected people with "syndromes" of heroism and villainy. He looks down upon those that use their abilities for either purpose, referring to acts of heroic sacrifice or petty crime as "sicknesses". Kai is extremely determined to his ambition of eradicating Quirks, not only due to his own personal phobias, but also because such a thing would allow the Yakuza to reclaim the power they once held over society. Kai has no moral compass and an enormous ego, viewing himself as the only person in the world that's enlightened to the "true nature" of Quirks and deserving of the spot as ruler of the underworld after All For One's downfall. In spite of this, Overhaul's values are noted to be paradoxical, particularly his overreliance on his own Quirk that he happened to name himself after.