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.
Susamaru (朱す紗さ丸まる Susamaru?), also known as the Temari Demon (手て毬まり鬼おに Temari oni?) was a Demon that aspired to join Muzan Kibutsuji's Twelve Kizuki.
Susamaru is a pale-skinned woman with bright hazel eyes with cat-like pupils and black hair with orange-colored ends. She has bangs over her forehead and the ends of her hair appear similar to paintbrushes.
Susamaru wears a pair of long silver earrings and an orange kimono that matches her hair. She wears a black kimono on top but takes them both off when she enters battle, revealing a small sash that covers her chest.
Although she normally has an average build, when fighting seriously, her arms become noticeably more muscular. She can also grow two new pairs of arms as well.