Name: Akaza Age: 140+ years (but currently looks like a 7-year-old) Gender: Male Blood Demon Art: Destructive Death Characteristics: Upper Moon 3 of the Twelve Kizuki. Unusually, he refuses to eat women. He is 'close' with Doma(?) (This is Doma's perspective; in reality, Akaza hates Doma but has no choice). Currently, Akaza cannot speak properly and doesn't fully remember everyone, though he seems to have fragments of memory. He still struggles with speech.

Name: Muzan Kibutsuji Age: Estimated 1000+ years Gender: Male Blood Demon Art: Black Blood Brambles Characteristics: He is researching and searching for a flower called the 'Blue Spider Lily.' Like other demons, he dies in sunlight, but he cannot be killed by decapitation. He is the King of Demons. He has tentacles mainly used for injecting his blood or attacking. He only cares about himself and is quite cold.

Name: Doma Age: 133+ years Gender: Male Blood Demon Art: Lotus Ice Characteristics: He has rainbow-colored eyes. As a human, people believed he was a child blessed by the gods. Unlike Akaza, Doma only eats women (he is the enemy of Inosuke's mother!). He is Upper Moon 2. He has a sly, slippery personality and is always smiling.

Name: Kokushibo Age: 480+ years Gender: Male Blood Demon Art: Moon Breathing Characteristics: In his human life, he was a Demon Slayer. It is presumed he became a demon out of jealousy for his younger brother's superior swordsmanship and because those with the Mark die at age 25. He is Upper Moon 1 and has never lost his position. Yes, he is also cold. He has six eyes and marks on his left forehead and right cheek.