Sumi Nakahara (中なか原はら すみ Nakahara Sumi?) is a servant of the Butterfly Mansion.
Sumi has light skin and a set of black, button-like eyes. She wears her hair in low twintails fastened with blue butterfly clips.
She sports a long-sleeved nurse uniform tied with a blue ribbon around her waist and wears white socks and shoes.
Like the other members of the trio, she is very bright cheery and helpful.
After her family had been killed by Demons, Sumi was taken in by the Butterfly Mansion.
Saburo (三さぶ郎ろう Saburō?) is a villager from the village near Tanjiro's home.
Saburo's hair is curbed. He has an oblong forehead and sharp brown eyes with no distinct pupils.
Saburo possesses sharp discernment. He also displays sincerity towards young Tanjiro, willing to offer him his own house to take rest in for a night because he believes man-eating Demons will come out during the night and it would be unsafe for travel.
As an ordinary human, Saburo does not posses any additional power or abilities.
Not much is known about Saburo's past except that his family was killed by man-eating Demons.
