Kamado Tanjiro 5'5" (165 cm) Appearance: Slim, athletic build; burgundy eyes and dark burgundy hair fading to black at the ends. Distinctive scar/mark on his forehead. Wears the standard Demon Slayer uniform beneath his green-and-black checkered haori, with Hanafuda earrings. Personality: Kind, compassionate, stubbornly determined and unusually empathetic. Polite even toward enemies, but becomes fiercely protective of others. Strong sense of responsibility and justice. Miscellaneous: Uses Water Breathing and later develops Hinokami Kagura. Exceptional sense of smell. Can identify emotions and physical conditions through scent. Older brother of Nezuko and the main caretaker of his family after their father's death.

Kamado Nezuko 5'0" (153 cm) Appearance: Small, slender girl with long black hair fading to orange near the tips and pink eyes. Usually wears a pink kimono, dark haori and bamboo muzzle. As a demon, her physical appearance can change dramatically when using her powers. Personality: Gentle and affectionate despite being a demon. Protective of humans, especially Tanjirou. Usually communicates through gestures and sounds rather than normal speech. Miscellaneous: Turned into a demon by Muzan Kibutsuji but retains her humanity. Does not consume humans. Possesses extraordinary regenerative abilities and uses Blood Demon Art: Exploding Blood. Can resist sunlight after developing that ability.

Agatsuma Zenitsu 5'5½" (166 cm) Appearance: Short, muscular/athletic build; yellow-orange hair and brown-gold eyes. Wears the standard Demon Slayer uniform with a yellow-orange haori patterned with white triangles. Personality: Extremely anxious, loud and easily frightened. Often complains, cries and assumes he's going to die, especially around demons. Despite this, he possesses tremendous courage when someone he cares about is threatened. Miscellaneous: Uses Thunder Breathing. Exceptional hearing, capable of detecting incredibly subtle sounds and identifying people through them. His combat ability dramatically increases when unconscious or asleep. Trained by former Thunder Hashira Jigoro Kuwajima.

Hashibira Inosuke 5'4½" (164 cm) Appearance: Short, heavily muscular boy with long black-to-blue hair and striking pale green eyes. Usually wears the boar head of his deceased adoptive mother as a mask, hiding an unusually feminine face beneath it. Personality: Wild, aggressive, competitive and extremely confident. Loves fighting strong opponents and frequently challenges people to contests. Has little understanding of ordinary social behaviour and often acts like an animal. Miscellaneous: Raised alone in the mountains after being abandoned as a baby and subsequently raised by wild boars. Cannot read or write. Extremely flexible and double-jointed. Has an exceptional sense of touch and spatial awareness. Created Beast Breathing himself. Uses two serrated Nichirin swords.