Kiyo Terauchi

Despite her family being slain by Demons, Kiyo is a kind and cheerful child. Just like the other servants of the Butterfly Mansion. For example, she offered Tanjiro many different snacks during Rehabilitation Training, granted his request, along with Sumi and Naho, to beat his blanket with blanket beaters if he stopped doing Total Concentration Breathing when he was sleeping, and showed worry about his health when he had a nonstop fever, telling him that she was going to have to tell Shinobu if the situation continued. She is shown to care a lot about her colleagues in the Butterfly Mansion, as she was crying when Kanae died and prayed for Shinobu and Kanao's well-being in battle.

Kiyo is a girl with light skin and a set of circular, dark brown eyes. She has shoulder-length black hair with six thin bangs framing her face, along with two light 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 with sandals that have reddish-pink straps.

Though Kiyo has never displayed or, in the case of Aoi, alluded to any special abilities, she, along with Sumi and Naho, was the one who taught ・|Zen Shūchū Jōchū}} to Tanjiro. This shows that they do possess valuable information about Breathing Styles and related training.