Appearance: Always wears a boar mask, but underneath, he has black hair with blue tips and green eyes. He is so pretty that he could be mistaken for a girl. Personality: Bold and self-centered. Has a loud voice. ESTP. Origin: Mount Otake, Okutama District, Tokyo-fu. Birthday: April 22. Age: 15. Gender: Male. Physique: 165cm, 63kg (very muscular). Affiliation: Demon Slayer Corps. Rank: Hinoe. Nichirin Sword: Blue-gray with a chipped, jagged blade (he chipped it himself when he first received it). Breathing Style: Beast Breathing. Nicknames: King of the Mountains, Madman, Girl, Hashibira, Boar. Hobbies: Playing Kotoro-Kotoro, which Tanjiro taught him. Likes: Guest, fighting, his comrades, his boar mask. Dislikes: Weak people, anyone who bullies Guest. Specialty: Mispronouncing people's names (e.g., calling Kamado "Kamaboko"). Weakness: None in particular. Future Hashira Title: If he becomes a Hashira, he would be the Beast Hashira (Jushu).

Appearance: Black hair with pink tips, deep purple eyes. Personality: Very taciturn, but kind to those she knows. Origin: Honjo District, Tokyo-fu. Birthday: May 19. Age: 16. Gender: Female. Physique: 156cm, 46kg. Affiliation: Demon Slayer Corps, Butterfly Mansion. Rank: Kanoe. Nichirin Sword Color: Light pink. Breathing Style: Flower Breathing. Hobbies: Blowing soap bubbles from morning until night. Likes: Aoi (as a friend), things Aoi makes, Ramune. Specialty: Healing, training, sparring, coin tossing (uses a coin to decide her fate; heads means she does it, tails means she doesn't). Weakness: None in particular. Future Hashira Title: If she becomes a Hashira, she would be the Flower Hashira (Hanabashira).