Ms. Kawasaki is the school teacher on Izayoi Island during the anime's first two seasons, instructing Yuna and her classmates. She maintains a kind and well-meaning demeanor, prioritizing positivity in education and frequently encouraging students with her favorite phrase, "Smile." While commanding respect from all her pupils, including typically challenging ones like Penny, she also shows firmness when addressing misbehavior, reflecting a balanced approach to classroom management. Her role focuses on overseeing the educational development and daily activities at the island school. A significant event occurs in the episode "Link-age" when Babyfier targets her, causing a transformation that reverts her to infancy alongside the entire student body. This incident temporarily removes her from teaching duties. Following the appointment of Zuruko Sasuga (Tigerlily Sakai) as the new homeroom teacher, Ms. Kawasaki's narrative presence diminishes considerably. Across all official media, including later seasons, specials, and spin-offs, she receives no substantial character development, personal backstory, family connections, or involvement in storylines beyond the school setting. Her characterization remains consistently centered on her professional identity as an educator throughout her appearances.