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

Over a century ago, Akaza was a human by the name of Hakuji before being turned into a demon personally by Muzan Kibutsuji.

As a demon, Akaza took the form of a tall and muscular young man with skin so fair that appears bright green-tinged white, decorated by a pattern of thick blue lines, which resemble the criminal tattoos he had as a human. Akaza had short, bright pink hair that fluffed out around his head, and inward-tilting yellow eyes with pink eyelashes and blue sclera that looked somewhat like cracked glass, the kanji for “Upper Rank Three” etched into their irises. The lines on his face curved through each of his eyes from below his ears to over his temples, another blue line running from the center of his hairline to the bridge of his nose, with two more lines running around his neck, three others branching off the lower one to his torso.

The center line ran directly down his chest to halfway down his stomach, and the other two branched off to the sides over each side of his chest to join the two other lines, this same three-line pattern there also repeating around his waist. On his arms there were lines running down the front of his shoulders that ran into to two more, which went around his biceps, before continuing to run down to his wrists, below which it could be seen that each of his fingers are also dark blue with an orange fingernail, his toes also sharing this unusual appearance.