Muzan Kibutsuji

Muzan Kibutsuji (鬼舞辻無惨 Kibutsuji Muzan) is the main antagonist of the Demon Slayer: Kimetsu no Yaiba fantasy horror manga and anime series.

Originally a human, he was cursed one thousand years ago and became the first demon. He is also the progenitor of most other Demons and the leader of the Twelve Demon Moons. He is also the enemy of the Kamado family and Tanjiro Kamado's archenemy. He is the one that killed the Kamado family, turned Nezuko into a demon and made Tanjiro an orphan.