Mina Hibino is a supporting character in Teasing Master Takagi-san the Movie, where she appears as a classmate of Takagi and Nishikata during their final summer of junior high school. She is easily recognized by her long brown hair, which she typically keeps tied back in a ponytail, her very short bangs, and her most distinctive feature, thick eyebrows paired with large brown eyes. Among her friends, she is the smallest in stature.

Her personality is defined by a cheerful and lively spirit. Mina is highly energetic, often acting on impulse and bringing a great deal of slapstick humor to the story through her eccentric behavior and lack of focus. She is the most childish member of her friend group, frequently dragging her companions into her antics. Despite her loud and sometimes chaotic exterior, she is deeply loyal to her friends and is known for her friendly and helpful nature, always ready to cheer others up. Her positive attitude is contagious, and she often encourages her friends to stay optimistic when facing challenges. On occasion, she also displays a competitive side, especially during school sports events.

Mina's motivations are tied to enjoying her time with her close friends and participating in the everyday fun of school life. She does not have a personal romantic subplot but instead serves as a consistent source of comedic relief. Her role in the movie is to provide lighthearted support to the main cast, contributing to the warm and relaxed tone of the story as Takagi and Nishikata care for an abandoned kitten.

Her key relationships are with her two best friends, Yukari Tenkawa and Sanae Tsukimoto, with whom she forms an inseparable trio. Yukari, the class representative, is often exasperated by Mina's antics, while Sanae, who is deadpan and stoic, frequently teases Mina with a dry sense of humor and sometimes plays along in teasing Yukari. The dynamic between the three is marked by a strong, lasting friendship. Mina is also the cousin of Sumire Hibino, though this connection is not heavily explored in the movie itself.

Throughout the series and into the movie, Mina shows little personal development in terms of romance or ambition, but her friendship with Yukari and Sanae remains a consistent anchor. In future timelines that appear in spin-off material, she grows up to become a cook at a daycare center, and later a kindergarten teacher, which reflects her nurturing yet playful nature. Her primary abilities are not related to any special skills but rather her athletic talent in school sports and her natural talent for lifting the spirits of those around her.