Gender: Male Body: 165cm, 56kg Appearance: He has a hairstyle with his forehead exposed, spiky reddish hair, and clear, deep red eyes. While he has a handsome face in the art style, he is often treated as less attractive due to the scar on his forehead. Personality: Bright, positive, oblivious, and polite. He has such an upright personality that his face contorts strangely if he tries to tell a lie because he is so honest. He is your younger brother. Likes: Fatsia shoots, mountain vegetables, Guest, the Tanjiro squad. Features: He has an incredibly hard head that defies imagination. Since his mother, Kie Kamado, also had a hard head and once chased away a wild boar with a headbutt, it seems to be hereditary. While it might seem like a gag setting, he has effectively used headbutts in combat to land significant blows on opponents.

Gender: Male Body: 166cm, 58kg Age: 16 Appearance: Characterized by two-toned hair that is generally blond with orange tips, thick eyebrows, dark circles under his eyes, and deep yellow pupils. His hairstyle is quite unique, with sections of hair appearing angular as if layers of square paper were cut and pasted together. Alias: None Personality: The ultimate fragile ego; he is the comic relief character who gets scared easily in crises and makes a fuss with his signature high-pitched voice. He loves women so much that he goes crazy whenever he sees a pretty girl or asks them to marry him. Hobbies: Hanafuda, Sugoroku. Likes: Sweets, expensive things, eel bowls, the Tanjiro squad, Guest. Features: His hearing is several times better than an average person's, allowing him to keenly perceive others' thoughts by listening to bodily sounds like heartbeats. Even when he realizes someone is deceiving him through this, his desire to believe in people leads him to keep trusting them anyway. He has a bit of a perverted streak.

Gender: Male Body: 164cm, 63kg Age: 15 Appearance: He has two-toned short hair with a black base and blue tips, unique bangs that gather in the center and cross each other, and green eyes with long eyelashes. Personality: Having grown up like a wild animal in the mountains, he is a hot-blooded and simple-minded battle maniac. Lacking common sense and deep thought, he challenges anyone—human or demon—who looks strong. He shows an excessively rough side, such as using children as stepping stones or speaking informally to everyone. However, he is gradually improving these traits after meeting Tanjiro and Zenitsu. Alias: King of the Mountains (Self-proclaimed) Likes: Tempura, the Tanjiro squad. Hobbies: Playing "Kotoro-Kotoro," which Tanjiro taught him. Features: Having strongly inherited the genes of his beautiful mother, Kotoha, his face is so pretty that he could be mistaken for a beautiful girl, creating a jarring contrast with his muscular body.