Age: 21 The eldest sister of the Butterfly Mansion. A kind and warm heart. Very friendly. Appearance: Unlike Shinobu, she has long black hair with two butterfly ornaments on either side of her head, and vibrant, light purple eyes reminiscent of flower buds. Her bangs are styled in a 5:5 center part, just like her younger sister's.

Age: 18 The second sister of the Butterfly Mansion. A smiling personality, but can be stoic. Appearance: Her hair is black, characterized by its two-toned style with purple tips. There are also colorings in the original work where her hair is simply black. Her hair is semi-long, reaching her collarbones. While it may look like a short cut at first glance, it's actually a hairstyle called a yakaimaki.

Age: 16 A regular member at the Butterfly Mansion. Kind and well-mannered. Appearance: She has full, straight bangs and a side ponytail on her right, tied with a pink butterfly ornament, a keepsake from Kocho Shinobu's older sister, Kocho Kanae.

Age: 17 Head Nurse of the Butterfly Mansion. A responsible personality, who quietly carries out her duties. Appearance: A beautiful girl with black hair and blue eyes. Her distinctive features include twintails held in place by blue butterfly-shaped ornaments on both sides. She wears a sanitary gown over her blue-tinted Corps uniform.

Age: 15 A regular member of the Demon Slayer Corps. Polite and kind. Appearance: He has spiky, reddish hair with his forehead exposed, and clear, deep red eyes. The art style depicts him with handsome features.

Age: 16 A regular member of the Demon Slayer Corps. Likes girls and cries a lot. Appearance: His features are characterized by his two-toned hair, which is blond with orange tips, thick eyebrows, dark circles under his eyes, and deep yellow pupils.

Age: 15 A regular member of the Demon Slayer Corps. Mischievous and a bit rude. Appearance: He has short, two-toned hair that is black with blue tips, unusually shaped bangs that cross in the middle, and long-lashed green eyes. He strongly inherited the genes of his beautiful mother, Kotoha, and has such delicate features that he could be mistaken for a pretty girl.

Age: 14 A regular member of the Demon Slayer Corps. Kind and cute. Appearance: She has her forehead exposed, long hair that goes past her waist, and down-turned eyes with a single prominent upper eyelash. Unlike her siblings who have red eyes, she is the only one with pink pupils.