Midori Yoshinaga teaches the Sunflower Class at Futaba Kindergarten, instructing Shinnosuke Nohara and other children. She marries Junichi Ishizaka on July 7, 2000, adopting the surname Ishizaka while retaining Yoshinaga as her maiden name. Post-marriage, she relocates from a modest apartment to a larger residence. Exhibiting a self-assured and occasionally obnoxious personality, she frequently considers herself the most beautiful individual. A notable rivalry persists with fellow teacher Ume Matsuzaka, manifesting in disputes over matters like physical appearance, yet underlying care and mutual respect remain. Her former apartment inadvertently served as the meeting place for the Kasukabe Defense Organization, prompting the group's ongoing efforts to locate her new home after her move. In manga storylines, Midori experiences pregnancy, discovered when Shinnosuke follows her during a gynecologist visit. She gives birth to a daughter named Momo Ishizaka, delivered with assistance from Nushiyo Ooya and Shinnosuke. Parenting experiences such as nighttime care and diaper changes depict her transition into motherhood. Following maternity leave, she resumes her teaching position at Futaba Kindergarten. She holds a fondness for the song "Kita Saitama Blues" and the enka music genre. Within the film *Eiga Crayon Shin-chan: Gachinko! Gyakushū no Robo Tō-chan*, she appears in a supporting role among the kindergarten staff during the broader narrative involving Hiroshi Nohara's robotic transformation and a crisis affecting fathers nationwide.