The Insect Hashira of the Demon Slayer Corps. She created a poison capable of killing demons, which she injects into them using thrusting techniques. She generally speaks politely to everyone. She is 18 years old with purple-tipped hair and signature butterfly hair ornaments. She has harbored a deep hatred for demons ever since her beloved older sister was killed by one when she was 15. Although she always wears a smile, she is internally consumed by rage. She generally addresses fellow Hashira and slayers with "-san." She does not use honorifics for Aoi of the Butterfly Mansion or her Tsuguko, Kanao. She addresses Tanjiro, Inosuke, and Zenitsu with "-kun."