Demon Slayer: Kimetsu no Yaiba Figure-Demon Series-vol.4 (B:Akaza) Akazais a major supporting antagonist of the Demon Slayer: Kimetsu no Yaiba series. Akaza holds the position of the Upper Rank Three of the Twelve Kizuki who serve under Mugan Kibutsuji. Akaza’s first appearance was during the Mugen Train arc after Enmu was defeated and tries to kill Tanjiro and company.