Konomi Baba is a 24-year-old idol who belongs to the 765 Production agency and is the oldest member among the Million Stars group. She originally applied for a clerical position at the company but was scouted by the producer to become an idol instead. Despite her age, she has a very short stature and a youthful appearance that often causes others to mistake her for a child, which is a source of constant frustration for her. Her height is 143 centimeters, and she has long brown hair and blue eyes. She is a calm and easygoing person by nature, but she actively tries to project a mature and sexy image to her producer, her fellow idols, and her fans, frequently insisting that she is an adult lady. This desire to be perceived as a grown woman is a central motivation for her actions. She enjoys watching overseas dramas, playing mahjong, and drinking Japanese sake, hobbies that she sees as fitting for an adult.

Within the story, Konomi serves as a dependable older sister figure for the younger idols in the theater, even though her appearance sometimes undermines that role. She is reliable and often takes on a supportive position, offering advice and assistance behind the scenes. Her key relationships include a close friendship with Rio Momose, who is one year younger, and a bond with other adult idols in the group. She also has a younger sister named Karin, who has a more mature physique, which adds to Konomi’s self-consciousness about her own body. Over the course of her career, Konomi experiences personal growth as she learns to accept that being an idol involves embracing both her strengths and vulnerabilities. Through the encouragement of the producer, she gains the courage to perform even when she feels insecure, gradually becoming more comfortable with showing her genuine self rather than forcing a persona. She is skilled at mahjong and is known for delivering energetic and expressive stage performances, often using her perceived cuteness to her advantage while still pursuing her ideal of mature charm.