Midori Yamano is a main character in the anime Hoka Hoka Kazoku, an educational slice-of-life series centered on the daily lives of a large multi-generational family. She is the eldest daughter in the Yamano household, a close-knit family that runs a small restaurant in a quiet neighborhood. Midori is fourteen years old and is depicted as cheerful, outgoing, and full of energy. Despite her youth, she is responsible and mature, often helping in the kitchen, greeting customers, and looking after her younger siblings. Her personality is defined by kindness, a strong sense of family duty, and an optimistic outlook that endears her to those around her.

Midori's primary motivation is to support her family and contribute to the success of their restaurant. She dreams of one day becoming a famous singer and sharing her love of music with others, but her immediate focus remains on the well-being and happiness of her household. In the series, she plays a central role in the day-to-day activities of the family, frequently participating in cooking, cleaning, and caring for the family dog, Pochi. Her relationships with her grandmother Yone, her mother Sachiko, her father Yutaka, and her younger brother Makoto are warm and cooperative, reflecting the show's emphasis on togetherness and mutual support.

Over the course of the series, Midori demonstrates personal growth by taking on increasing responsibility and learning practical life skills through the family's experiences. She is a talented cook and baker, and her singing is often showcased at local events. Her ability to balance her personal ambitions with her dedication to her family makes her a well-rounded character who embodies the themes of diligence, warmth, and harmony that define the show.