Namie Yaguchi is the mother of the protagonist Haruo Yaguchi in the anime Hi Score Girl II. She is a petite woman with short brown hair and brown eyes, often seen wearing a red overall dress over a white long-sleeved shirt and blue sandals or slippers. Her age is not specified, but she has a youthful appearance. Namie lives at home with her son while her husband works away from the family on a job transfer, though the couple maintains a stable and affectionate marriage despite the distance.

Her personality is energetic, playful, and sometimes eccentric. She frequently makes jokes and teases her son, which often annoys Haruo, but it is clear that she deeply cares for him. Namie expresses her love in a bustling, hands-on manner, and she is accepting of Haruo's quirks, even when his intense obsession with video games bewilders her. She supports his hobbies with an open mind, allowing him the freedom to pursue his passion for arcade gaming. At the same time, she is not afraid to discipline him when necessary, such as when he behaves rudely or brings home bad grades. This balanced approach shows that she is both a nurturing and a firm parent.

Her role in the story is primarily as a supportive family presence. She provides a warm, stable home environment that contrasts with the more turbulent aspects of Haruo's social life. Namie also develops a gentle, caring relationship with Akira Ono, treating her with kindness and welcoming her into the household. While she does not drive the main plot, her interactions offer insight into Haruo's upbringing and motivations, grounding the series in a relatable domestic setting. She remains a consistent character throughout both seasons, with no major personal development arc; her steady, loving nature is a constant in Haruo's life. Notable abilities include her knack for pop culture references that reflect the 1990s setting and her quick, playful humor that lightens the mood of the series.