Kotetsu Katsura is a tower witch who serves as an underling of Medusa in the series Witch Craft Works. She is one of the members of the Ivory Quintet, a group of tower witches assigned to capture the protagonist Honoka Takamiya. After the second defeat of Tanpopo Kuraishi, Kotetsu is transferred to Honoka's class along with the other tower witches. She is a teenage girl of moderate height, with black hair and black eyes. Her typical expression is surprisingly gentle, which contrasts with her role as an antagonist. Personality-wise, Kotetsu is fairly quiet and sedate, though she is capable of a friendly and kind demeanor when away from her duties. She tends to follow the lead of Tanpopo Kuraishi, the unofficial leader of the KMM Gang, rather than asserting her own initiative. Despite her reserved nature, she is sociable at times and is a member of the school's kendo club, indicating an athletic background. Within the story, Kotetsu acts as a supporting antagonist, participating in schemes to steal Honoka's power for the tower witches. Her key relationships are with her fellow tower witches, especially Tanpopo Kuraishi and Mei Menowa, with whom she is often seen. She does not undergo significant personal development beyond her initial allegiance, remaining a loyal but unassuming member of the group. As a tower witch, she possesses magical abilities, though her specific powers are not highlighted in the narrative; her strength lies more in being a cooperative team player within the KMM Gang.