Akiha Tohno is a central character in the visual novel and anime series Tsukihime. She is the younger sister of the protagonist Shiki Tohno and serves as the head of the Tohno family. Known for her strict and serious demeanor, Akiha takes on the responsibilities of managing the household and protecting her family’s secrets. Despite her cold exterior, she deeply cares for Shiki and struggles with her own inner demons, as she harbors a mysterious power inherited from her family's lineage. Her role is pivotal in unraveling the series' supernatural elements.