Nanami Minami possesses long, near-black hair extending over her shoulders, matching long eyebrows, and large brown eyes. Her personality blends a reserved, introverted nature with a tendency to share improbable stories, such as claims about government contact with extraterrestrials or concealed earthquake reports. This behavior reflects underlying insecurities and struggles with identity and self-worth. She feels deep protectiveness toward her younger cousin, Nono Nekomiya, and actively tries to dissuade Nono from traveling to Tokyo. Nanami employs exaggerated warnings about fabricated dangers, including threats of natural disasters and government cover-ups. She further interferes in Nono's relationship with Makoto Yūki by destroying his letters and avoiding his phone calls to limit their communication. These actions stem from a desire to shield Nono but manifest as controlling behavior. Throughout her arc, Nanami grapples with personal growth and self-discovery. Her quiet demeanor contrasts with more outgoing characters, and her observations contribute to narrative progression. She embodies themes of internal conflict, particularly regarding her place in the world and the balance between her protective instincts and the autonomy of others.