Akaza (猗あ窩か座ざ, Akaza?) is a major supporting antagonist of Demon Slayer: Kimetsu no Yaiba. He was a demon affiliated with the Twelve Kizuki, who was holding the position of Upper Rank Three (上じょう弦げんの参さん, Jōgen no San?). Now, he is a Sinner Demon stuck in the Hazbin Hotel. Over a century ago, Akaza was a human by the name of Hakuji (狛はく治じ, Hakuji?), a prodigious martial artist who trained under Keizo while nursing his daughter, Koyuki, who would later become Akaza's fiancée.