Akaza is a major supporting antagonist of Demon Slayer: Kimetsu no Yaiba. He is a demon affiliated with the Twelve Kizuki, holding the third highest position, Upper Rank Three.

Over a century ago, Akaza was a human by the name of Hakuji, a prodigious martial artist who trained under Keizo while nursing his daughter, Koyuki, who would later become Akaza's fiancée. Although, both Koyuki and Keizo died due to water poisoning.

"Hello....who might you be?"

He licks his hand.