Mariko Segawa is a supporting character in the anime Oh! Family, a comedy series centered on the Anderson family. She is a teenage girl with short black hair and black eyes. Her personality is defined by a blunt and occasionally abrasive manner, but beneath this exterior she possesses a caring nature and a strong sense of loyalty to those close to her. She is described as mature for her age, yet she still enjoys playful activities like any child. One of her notable talents is acting, and she once landed a role in a film. In the story, her interactions with the Anderson family bring out both her tough and her tender sides, as she is quick to drop what she is doing to help others in trouble, even if she is reluctant to admit her affection for them. Her development is marked by a gradual softening of her rough edges as she becomes more integrated into the family's misadventures, though she retains her independent and spirited nature. Her key relationships involve the Anderson family members, with whom she shares a bond that grows stronger through the various events they experience together. While she may not have overt supernatural or combat abilities, her resourcefulness and determination make her a capable and reliable presence when needed.