Setsuko Ōhara serves as the mother of Shota and Shinichi in the Ōhara household, maintaining her role as a housewife consistently across official media. Despite no biological relation, she treats the ghost Q-Taro as her own child, with Q-Taro typically addressing her as "Mama". She embodies a diligent and caring presence within the family, managing household affairs and preparing meals. Her responsibilities include accommodating Q-Taro's substantial appetite by routinely cooking larger food portions for him. Setsuko demonstrates dedicated domestic stewardship and a nurturing approach toward all children in the home, including supernatural residents.