Kiyo Terauchi (寺てら内うち きよ Terauchi Kiyo) is a servant of the Butterfly Mansion.
Kiyo is a girl with light skin and a set of circular, black eyes. She has shoulder-length black hair with thin bangs framing her face, along with two pink butterfly clips on each side of her head.
Kiyo wears a long, white nurse dress tied with a dark, reddish-pink bow around her waist. She also sports white socks and shoes.
After her family had been killed by Demons, Kiyo was taken in by the Butterfly Mansion.
Yushiro (愈ゆ史し郎ろう Yushirō?) is the traveling companion of Tamayo and a close ally of Tanjiro Kamado. He was turned into a Demon by Tamayo.
Yushiro has the appearance of a young boy with pale skin and bright lavender purple eyes. He has short hair that is neatly styled and vertically shaded from a dull green to black. Yushiro wears a button-up shirt under an all-white kimono and dark blue pants.
Yushiro was a human who was under the care of Tamayo as she was practicing as a medical practitioner. He was in frail state fighting a disease when Tamayo gave him the choice of succumbing to his illness or to live longer as a Demon. He agreed to become a Demon and has since stayed by Tamayo's side serving as an assistant as well as her guard.
