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Yorichii is Michikatsu's twin brother, but he ended up becoming an oni when he tried to kill Kagaya Kibutsuji. Yorichii's appearance: he had black and red hair, his eyes were completely black. His skin was black, he had red horns. He is 22 years old. Personality: kind, calm, understanding, and quiet.

Muzan Ubuyashiki's personality: quiet and irritable. He has a curse for being from the Kagaya Kibutsuji lineage; he ends up dying before the age of 30. He is 24 years old.

king of oni: kagaya kibutsuji

upper moons: Iwao (gyomei) - upper moon 1 Chouka (shinobu) - upper moon 2 nagi (giyu) and Hayate (Sanemi) - upper moon 3 Oroshi (obanai) - upper moon 4 kasumi (muichiro) and kiri (yushiro) - upper moon 5 homura (kyojuro) - upper moon 6 airi (mitsuri) - lower moon 1 Akio (uzui) - Lower Moon 2

Yushiro/Kiri is Muichiro/Kasumi's twin brother.

Iwao's personality: calm, quiet, and pessimistic.

Chouka's personality: cheerful, sarcastic, and cruel. She loves to tease Nagi.

Hayate personality: angry, aggressive, violent, and cruel.

Nagi personality: quiet, calm

Orashi: Calm, sharp-tongued, sincere and jealous, likes Airi.

Kiri's personality: quiet, grumpy

Kasumi's personality: sarcastic, childish, cheerful, and spoiled.

Homur's personality: cheerful, vibrant, and optimistic.

Airi personality: cruel, loving, seductive, and vain; she likes Orashi.

Akio's personality: egocentric, selfish, and vain.

The oni resided in the Infinite Castle, which was controlled by Oroshi. He controlled the castle using a Shinobue, a type of flute, so when he played it, Oroshi could manipulate the Infinite Castle.

‼️Orochi controlled the Infinite Castle using a flute‼️

Kagaya Kibutsuji personality: manipulative, "gentle," elegant, aristocratic, constant fake smile, "affectionate"

Urogi: He is a 23-year-old young man with black hair and yellow eyes. He is cheerful, fun-loving, and funny. Hashira of the Birds.

Karaku: He is cheerful and finds pleasure in seeing the pain of others. He is a young man with black hair and green eyes. He is the Hashira of the Wind.

Karaku, Sekido, Aizetsu, and Urogi are quadruplets; Zorakuten is their youngest brother.

Nakime: She is a beautiful young woman with long black hair and green eyes. She is shy, quiet, and always playing her biwa. Hashira of the Sound.

Managi: He is a young man with purple hair and green eyes. He is extremely confident and egocentric. Hashira of the Water.

Kaigaku: He is a 16-year-old with black hair and turquoise eyes. He shares the position of Thunder Hashira with Sekido. He is not easy to talk to; he is always irritable, but he secretly likes Ume. He has a terrible relationship with Yorichii, Genya, Tanjiro, and Nezuko. He doesn't trust Tanjiro, Yorichii, and Genya because they are demons, and he doesn't trust Nezuko because she hangs out with Tanjiro, and he doesn't trust Gan because he is the younger brother of an Upper Moon. He has a terrible relationship with Kanao because she is dramatic and annoying. (Kanao has the same origin and personality as Zenitsu)

(Information: Aoi has Inosuke's personality and Inosuke has Aoi's personality; Inosuke is quiet and doesn't smile easily. Aoi, she had Inosuke's personality from the original class.) Ume: She is a beautiful young woman with long white hair and blue eyes. She is kind and sweet. She is the Hashira of Love. She has a crush on Kaigaku.

Muzan Ubuyashiki: He was the master of the squad. He had black hair and blue eyes, and he was always with his wife, Tamayo. She had black hair and purple eyes.