The sole survivor of Tanjiro’s family, transformed into a demon yet retaining her humanity and cognitive functions. Initially restrained by hypnotic suggestions to suppress demonic urges, she accompanies her brother on his quest. She notably develops a rare immunity to sunlight, becoming a pivotal factor in Muzan’s defeat. After Tanjiro is temporarily turned into a demon, she helps reverse the process. She eventually regains full humanity and marries Zenitsu Agatsuma.