Nami Hitō attends class 2-F at her high school, defined by a fierce resentment of her perceived ordinariness compared to eccentric classmates. She rejects the label "normal" as offensive, associating it with boredom, and reacts negatively to such descriptions. Her name originates from the Japanese term "hitonami" (人並み), meaning "average" or "run-of-the-mill," reflecting her role as conventionality's embodiment.

Physically, Nami possesses short black hair, brown eyes, and no particularly distinguishing features. Her appearance sometimes includes slightly chubbier cheeks, often linked to overeating. To combat perceptions of normalcy, she engages in attention-seeking behaviors: feigning truancy, displaying injuries, or staging suicide attempts to elicit pity or concern.

She is frequently seen using Apple products like iPhones and MacBooks and expresses a fondness for ramen. Her background includes attending elementary school with Kafuka Fuura, who may have been the first to label her ordinary, though this detail isn't explicit in the present timeline. During the series' planning stages, Nami was originally intended as the main heroine. Her portrayal consistently centers on her struggle against being perceived as mundane.