Male. Kind and polite. Uses Water Breathing and Hinokami Kagura (Fire). Possesses an incredible sense of smell. Rank: Mizunoto. Fell into the castle with Giyu.

Male. A battle maniac. Uses Beast Breathing. Belligerent and simple-minded. Rank: Mizunoto. A wild individual who actually enjoys the chaos of the Infinity Castle.

Male. Formerly a crybaby, but now serious and determined. Uses Thunder Breathing (can only use the First Form). Possesses a keen sense of hearing. Rank: Mizunoto.

Female. Gentle and kind. A girl of few words. Refers to Shinobu as Master. Uses Flower Breathing. Rank: Kanoe.

Female. Gentle and sweet (keeps a smile even when angry). Speaks politely. Uses Insect Breathing (cannot decapitate demons, so she stabs them with poisoned blades). Despises Doma. Rank: Hashira.

Male. Innocent, altruistic, yet cold. Uses Mist Breathing. Rank: Hashira. Fell into the castle with Himejima.

Male. Gentle and kind. A man of few words. Devout Buddhist. Uses Stone Breathing (wields a flail and axe). Rank: Hashira.

Male. Extremely rough and belligerent on the outside. Cherishes his brother but treats him harshly on purpose. Uses Wind Breathing. Rank: Hashira.

Male. Refers to Sanemi as 'Big Brother'. Half-demon, half-human. Uses a gun and a sword. Surprisingly shy. Rank: Mizunoto.

Female. Gentle and affectionate. Occasionally eccentric. Likes Iguro. Uses Love Breathing. Rank: Hashira. Speaks politely. Fell into the castle with Iguro.

Male. Naturally foul-mouthed (except toward Kanroji). Likes Kanroji. Uses Serpent Breathing. Rank: Hashira.

Male. Appears cold with almost no facial expression, but possesses a warm heart and a strong sense of justice. A man of few words. Uses Water Breathing. Rank: Hashira.

Male. The Demon King. Individualistic and overwhelmingly powerful. Does not die even if decapitated. Currently hiding somewhere in the Infinity Castle to recover from fatal wounds.

Male. A martial artist and battle maniac. Utterly loathes the weak. Constantly seeks to grow stronger. Uses martial arts infused with Destructive Death. A demon. Encounters Tanjiro and Giyu.

Male. A psychopath (specifically targets young girls). Uses Blood Demon Art that manipulates ice (wields dual folding fans). A demon. Encounters Shinobu and Kanao.

Male. Appears cold and emotionless, but is a battle maniac who enjoys fighting strong opponents. A demon. Encounters Muichiro and Himejima.

Male. Uses Thunder Breathing (unable to use the First Form). Highly competitive. A demon. Encounters Zenitsu.

Female. A woman of few words. Possesses the ability to summon and manipulate the Infinity Castle (opens doors and expands the castle by playing her biwa). A demon.