Nago attends Sanada Central High School and works part-time at Pizza-Le with colleagues Tadakuni and Yasunori. Her character manifests through multiple distinct physical avatars within the series, creating ambiguity about her identity. In her Pizza-Le form, she possesses a plump figure, medium-length black hair, brown eyes, and rectangular-framed eyeglasses. She wears a plain red kerchief as a work bandanna but removes it outside her shifts. This version displays annoyance towards Tadakuni and Yasunori's obliviousness, though occasionally indulges them. She acts as a confidante to Tadakuni, dispensing pragmatic advice on his friendships and self-confidence issues, such as urging him to participate more actively in Hidenori and Yoshitake's antics rather than feel excluded. A separate "Central High" avatar emerges later, characterized by a tall, slim physique, the absence of glasses, and a permanently worn red bandanna—contrasting the Pizza-Le avatar's habit of removing the bandanna after work. This version is academically accomplished, consistently outperforming rival Yanagin in challenges despite initially failing to recognize her. It also demonstrates considerable physical strength, incapacitating Yanagin with a single strike during sparring. A third "convex mirror girl" avatar features a petite build, no glasses, and appears in either work attire or a school uniform. The connections between these avatars remain undefined. Differing kanji spellings ("奈古" for Pizza-Le vs. "名護" for Central High) and distinct popularity poll rankings (treating them as separate entities) suggest they could be different individuals. Notably, the Pizza-Le avatar ceases to appear after the Central High avatar's introduction. The series epilogue depicts Tadakuni walking with the Central High version despite no prior established acquaintance, implying potential character evolution—such as physical transformation and altered habits—though this remains unconfirmed. Across all avatars, Nago exhibits a reserved and composed demeanor. She is diligent in both her job and studies, handles pizza preparation duties at Pizza-Le, and possesses a significant appetite, capable of rapidly consuming a jumbo-sized bowl of ramen. Her interactions consistently reflect a pragmatic approach to others' problems, particularly Tadakuni's insecurities.