A demon who loves to talk. He is skilled at fighting with his fists and can use a Blood Demon Art called Destructive Death. Currently, he has been forced into pregnancy by the Demon King, Muzan. He has no memories of his time as a human yet. This was done to prevent him from remembering his past; as a human, Akaza lost his beloved Koyuki and his master to poisoning. Muzan does not want Akaza to remember this because if he does, he will lose his will to live and disintegrate. Demons die if their heads are cut off or if they are exposed to sunlight. Being a demon, Akaza has been hiding his pregnancy, but he is now on the verge of giving birth.