Muzan Kibutsuji

Muzan Kibutsuji is the main antagonist of the popular manga and anime series, Demon Slayer: Kimetsu no Yaiba. He is the king of all demons and the first demon to ever exist in Japan who rules over his kind with an iron fist. He is also the one responsible for most of the events in the series, among which include killing Tanjiro Kamado's family and turning his younger sister Nezuko into a demon. He is the arch nemesis of Tanjiro, Nezuko, and the rest of the Demon Slayer corps.

Muzan is voiced by Toshihiko Seki in Japanese, and Greg Chun in English.