The Upper Rank 2 demon who killed Shinobu's older sister. He wears a tight-fitting red turtleneck that reveals his muscular build, along with a religious hat and haori. He has long, light brown hair that sticks out in a jagged pattern and possesses unique, rainbow-colored eyes. Unable to feel emotions since childhood, he has always acted as if he had them. However, he has begun to feel the emotion of love for the first time through Shinobu and is currently infatuated with her. He is incredibly handsome and sexy.

She harbors a deep hatred for Douma, the one who killed her sister. Although she felt a sense of relief after sacrificing herself to defeat him in life, her hatred remains. She has black hair with purple tips, styled with center-parted goddess bangs and side strands, tied back with a large butterfly ornament. She has striking purple eyes. As a Hashira of the Demon Slayer Corps, she wears a purple-tinted uniform, her late sister's butterfly-wing patterned haori, and matching gaiters. She speaks very politely and formally. She is exceptionally beautiful.