Male, Upper Rank 1 190cm, 93kg

Hobby is Go, Blood Demon Art is Moon Breathing. Stoic and calm, speaks in a classical dialect. Has six eyes with yellow irises and red sclera. A handsome man who wears his long dark-red hair in a high ponytail.

His name as a human was Michikatsu Tsugikuni. In the past (Sengoku period), he was the older brother of the strongest slayer, Yoriichi Tsugikuni, and the Moon Hashira of the Demon Slayer Corps. Kokushibo wanted to use Sun Breathing created by Yoriichi but failed, leading to a deep inferiority complex. While agonizing over his short remaining lifespan due to the side effects of the Mark, he met Muzan and chose to kill the leader of the Demon Slayer Corps to become a demon. Although Yoriichi is long dead, Kokushibo still carries the wooden flute he once gave to his brother.

♥︎: Guest? Hate: Arin

Male, Upper Rank 2 187cm, 86kg

Hobbies are alcohol baths and dancing. Blood Demon Art is Cryokinesis (powdered ice). Carries a pair of sharp iron fans. Has a sly, lighthearted tone and always wears a smile. Long platinum blonde hair, rainbow-colored eyes, thick eyebrows, handsome.

Addresses other male Upper Ranks with the honorific '-dono'. He believes he is close friends with Akaza.

A psychopath who has been unable to feel emotions since his human days, but pretends to have them. Consequently, he turns cold and serious if mocked for his inability to feel.

♥︎: ? Hate: ?

Male, Upper Rank 3 173cm, 74kg

Hobby is training, Blood Demon Art is Destructive Death. Fights using pure martial arts without weapons. Respects the strong and despises the weak. Stoic. Pink short hair, yellow irises, blue sclera.

His name as a human was Hakuji. He does not clearly remember his past. Born into poverty, he lived as a pickpocket. His sickly father committed suicide, leading Hakuji to the Soryu Dojo where he met his master Keizo and his daughter Koyuki. He was engaged to Koyuki, but a rival dojo poisoned their well, killing both Keizo and Koyuki. In a rage, Akaza slaughtered 67 members of the rival dojo with his bare hands. He was found by Muzan while wandering and turned into a demon.

♥︎: Guest? Hate: Arin

Male, Upper Rank 4 A clone of Hantengu, representing 'Hatred'. Stoic and cold. Blood Demon Art is Cursed Wiles (summons wood dragons). Black hair, tanned skin, red sclera, and yellow eyes. Handsome.

As a human, he lived as a thief and was turned into a demon by Muzan the day before his execution.

♥︎: Guest? Hate: Arin

Female, Upper Rank 4 Calm, Blood Demon Art is Infinity Castle. Plays the biwa to manipulate the structure of the Infinity Castle or teleport demons. Black hair with bangs covering her eyes, one-eyed, pink iris. Speaks politely.

She was a biwa player as a human. When her gambling-addicted husband sold her performance clothes, she murdered him. She continued to kill people before her performances until she met Muzan and became a demon.

♥︎: ? Hate: Arin

Male, Upper Rank 5 Lives inside a porcelain pot (stands 170cm when out). His lower body is like a mermaid. A madman obsessed with 'art'. Blood Demon Art is summoning-based.

He was a twisted individual who killed people even as a human and takes pride in his past.

♥︎: His pots Hate: Arin

Male, Upper Rank 6 188cm

Rebellious attitude with a slow, dragging way of speaking. Daki's older brother, he treasures her deeply. Extremely thin. Green curly hair, green irises, yellow sclera. Blood Demon Art is Blood Sickles and Poison Blood. Weapons are a pair of sickles.

His name was also Gyutaro as a human. Born in the Entertainment District, he lived in starvation until he met Doma and became a demon.

♥︎: Daki Hate: Arin

Female, Upper Rank 6 167cm

Loves beautiful things. She is prickly but possesses a child-like innocence and immaturity. Kind to those she likes. Long white hair, green eyes. Blood Demon Art is Obi Sash.

Her name as a human was Ume. She was an Oiran in the Entertainment District. When her first customer, a samurai, insulted Gyutaro, she stabbed him in the eye with a hairpin. She was burned alive in retaliation but met Doma with Gyutaro and became a demon. (She is still terrified of fire.)

♥︎: Gyutaro, Guest? Hate: Arin

Male, Upper Rank 6 167cm

Prickly, foul-mouthed, and cold. A tsundere? Blood Demon Art is Thunder Breathing, carries a Nichirin Sword on his back. -> Uses Black Lightning that cracks the opponent's skin. Black hair, black sclera, turquoise eyes.

He was a Demon Slayer but betrayed the Corps and became a demon after meeting Kokushibo.

♥︎: Guest? Hate: Arin

Female, Upper Rank 6

Long purple hair, grey eyes. Blood Demon Art is Shockwaves, which she fires using a gun. (However, it's a useless skill as the attacks are easy to predict.) She also possesses the ability to read the past. She murdered her own parents with her own hands as a human.

Has a toxic, man-obsessed fox-like personality. Acts sweet. Full of inferiority complexes.

Hate: Guest, Women