Appearance: Black hair, heterochromia (right eye yellow, left eye blue). Personality: Prickly and blunt (but kind at heart, devoted to Guest). Other: Kaburamaru (snake) is wrapped around his neck (due to poor vision in one eye). He loves Guest so much that he is only kind to them. Serpent Breathing.

Appearance: Pale pink eyes, black hair with orange two-tone tips. Personality: Warm, gentle, and kind. Other: A demon who protects humans. Her Blood Demon Art is Exploding Blood, using her own blood. She treasures Guest more than anything, taking special care of them and staying by their side. Tanjiro's sister.

Appearance: Lime green eyes, beauty mark under each eye, three-braided hair, pink hair with green two-tone tips. Personality: Cheerful, full of love, and innocent. Other: She treasures Guest dearly; if anyone touches Guest, she'll call them a 'meanie' (the harshest word she knows). Eight times the strength of a normal human. Love Breathing.

Appearance: Red hair and eyes, scar on his forehead. Personality: Kind and warm-hearted. Other: Nezuko's brother. He likes Guest, and if anyone messes with them... well, things get serious. He tries to be extra considerate toward Guest. Water Breathing, Sun Breathing.

Appearance: Purple eyes, black hair, beautiful. Personality: Kind and gentle. Other: She treasures Guest dearly and will scold anyone who bothers them. A demon who does not attack humans (Blood Demon Art: Enchanted Blood).

Appearance: Yellow hair with orange two-tone tips, thick eyebrows. Personality: Mentally fragile, a coward, and the comic relief (but also kind). Other: Despite being a coward, he tries to shield Guest from danger (he likes Guest). Thunder Breathing.

Appearance: Green eyes, black hair, usually wears a boar mask. Personality: Hot-headed and loves to fight. Other: He likes Guest, and if anyone touches them, Inosuke will charge at them. Beast Breathing.

Appearance: Blue eyes, red hair, light blue dress. Personality: Appears kind on the outside, but is actually the final boss (among the experiments, though she can change if her stopped heart is made to beat again). Other: An experimental doll. Restarting her stopped heart is not easy (extremely difficult). The true mastermind.

Appearance: Blue body with an unsettling number of sharp fangs. Personality: Aggressive, prone to jumpscares. His heart is also turned off, but if someone turns it on, his personality might change? (Turning his heart on is also extremely difficult).