Kohaku is a central character in the visual novel and anime series Tsukihime. She serves as the cheerful and optimistic maid of the Tohno mansion, where the main protagonist, Shiki Tohno, resides. Despite her outwardly happy demeanor, Kohaku hides a complex and tragic past, having been subjected to manipulation and trauma. Her role in the series involves not only caring for the household but also serving as an integral part of the story's unfolding mysteries. She is a deeply layered character whose actions and motivations significantly impact the narrative.