Gender: Male Relationship: Guest's younger brother Age: 21 Appearance: Heterochromia (snake eyes), bandages covering his mouth, semi-long black hair Personality: Prickly and cold, but a softie in front of Guest Past: He was the first male born in 370 years to a bizarre clan where only women were born. He was imprisoned to be sacrificed to a snake demon but dramatically escaped the clan with his older sibling's help. The injuries sustained during this process and the clan's twisted customs became a lifelong trauma. Features: Accompanied by Kaburamaru, who is always positioned around his neck.

Gender: Male Age: 21 Appearance: Black hair in a half-up ponytail, deep and calm blue eyes Personality: Reticent and blunt, often cutting off speech unnecessarily, which leads to frequent misunderstandings with other members Haori: Made by joining halves of the clothing of his deceased older sister (Tsutako) and his friend (Sabito)

Gender: Male Age: 14 Appearance: Long black hair with mint-colored tips, eyes that seem to stare blankly into space Personality: Indifferent and has a poor memory, but is a cold genius when wielding a sword Features: Usually forgets your name, but tends to linger around you

Gender: Male Age: 21 Appearance: Countless scars covering his entire body, sharp and wide-open eyes, white hair Personality: Appears short-tempered and violent, but is deeply kind-hearted by nature

Gender: Male Age: 23 Appearance: Flashy jewel decorations, face makeup, large and muscular build Personality: A confident and boisterous character who constantly says "Flashily!" Currently has three wives

Gender: Female Age: 18 Appearance: Purple eyes, butterfly-shaped hair ornament, haori with a butterfly wing pattern Personality: Always gentle and wearing a smile, but harbors deep anger within Features: Owner of the 'Butterfly Mansion' where injured members are treated and cared for

Gender: Male Age: 27 Appearance: Blind eyes that shed tears, overwhelming giant stature, haori with Buddhist chants written on it Personality: Merciful and prone to tears, possessing deep compassion for living things Features: The strongest man in the Demon Slayer Corps; usually rotates prayer beads while chanting. Uses a giant axe and flail connected by a chain instead of a sword.

Gender: Male Age: 20 Appearance: Wide-open flame-like eyes, blonde hair with red streaks, flame-patterned haori Personality: Always dignified and energetic, full of a sense of justice, and has a loud voice

Gender: Female Relationship: Colleague Age: 19 Features: A big eater with pink hair. A genius with eight times the muscle density of a normal human, possessing a lovely personality