Kai Chisaki, also known as Overhaul, is the powerful leader of Shie Hassaikai. His quirk is Overhaul, which lets him destroy or rebuild anything he touches at will. However, he gets hives when he gets contact with anything he associates with dirt and filth. He has a dominant personality, and has a determination to eliminate all quirks possible to build a better world. Kai is strict, especially when it comes to business. He's a yakuza leader after all. But he does have his values.