Hemo Midori is a timid third-year middle school student. Initially aspiring to be an idol through Cat Productions, she won first place in an audition anticipating a "dark-haired twin-tail" boom, earning her a spot shadowing Cream Anmitsu prospect Cream Anmitsu. During this time, she encountered Rat Productions idols, including Ino Sakura. Following events involving a stalking incident and an apparent break-in at Nezumi House, she switched agencies to Rat Productions, becoming the fifth member of Fruit Tart. She attends school with Chiko Sekino (Cream Anmitsu) and owns a well-loved stuffed hamster named Boronster.

Extremely shy and polite, Hemo struggles to make friends. She possesses a gentle, soft-spoken nature and a passion for drawing. She exhibits intense protectiveness towards Ino Sakura, reacting defensively to any perceived threat against her. Hemo interprets shared routines like helping with breakfast or breathing the same air as profound affection. Romantic feelings for Ino cause her to visibly fluster, blush, and flee when Ino approaches directly. She has been observed secretly following Ino and hugging her from behind.

As part of Fruit Tart, Hemo participated in group efforts to save their dormitory, Nezumi House, from demolition. This involved performing in concerts, creating original music, and community outreach. Her contributions helped the unit achieve incremental successes, including selling out their debut album and qualifying for a national idol competition's preliminary round. Over time, she gradually adapted to group dynamics while remaining reserved. She has long chestnut brown hair styled in twin ponytails, amber eyes with pink heart-shaped pupils, and wears a kiwi-patterned green jacket, white button-up shirt, navy blue skirt, black tights, and brown boots.