Namie Ameno serves as the deputy manager of the Shijo Minami Middle School girls' soft tennis club. She has auburn hair, usually worn in a ponytail, and brown eyes. Namie is the older sister of Itsuki Ameno, a member of the boys' soft tennis team. She treats members of the opposing boys' team with kindness and respect. Namie shows care for her younger brother and will scold him if she discovers he has hurt someone. The Ameno family underwent a divorce, with their mother leaving after the separation.

A student at Shijo Minami Middle School, Namie has Sakura Muroi as her homeroom teacher. She frequently walks home with her brother after school, reflecting their close relationship. On one occasion, she was present to support Itsuki following a confrontation with other students. Her given name, Namie, combines the characters for "apple tree," "beautiful," and "favor or benefit," while her surname, Ameno, means "rain" and "field or wilderness."