Maki Nishikino is a first-year student at Otonokizaka High School and a member of the school idol group μ's, specifically the subunit BiBi, with red as her image color and a star as her symbol. She comes from a wealthy, highly reputable family of doctors who own a hospital. As the only child and sole heiress, she faces significant pressure to follow her parents into medicine, despite her passion for music. This expectation initially led her to refuse invitations to join μ's, prioritizing medical studies over her interests. She eventually admitted her love for music and joined the group. Her family's wealth includes a beach house, used by μ's in Season 1 Episode 10, and a mountain vacation house revealed in Season 2 Episode 2. Maki exhibits a tsundere personality, often appearing aloof or standoffish as she struggles to admit her true feelings. This stems from her sheltered upbringing and solitary habits, including spending much time alone in the music room before joining μ's. She holds somewhat childish beliefs, like her unwavering faith in Santa Claus, which she defends by describing cleaning the chimney for him. Her stubbornness is noted by other characters, particularly during conflicts with Nico Yazawa, where Rin Hoshizora points out Maki's equal stubbornness. Despite her background, she is not inherently conceited; occasional insensitivity or arrogance results unintentionally from her difficulty expressing emotions. She gradually opens up to the group over time, though elements of her earlier isolation resurface in moments of social awkwardness. Musically, Maki is a skilled pianist and serves as μ's primary composer and vocal coach. Her hobbies include stargazing and photography. She excels academically, achieving perfect test scores; her lowest recorded score was 68, causing tension with her father that required μ's intervention to allow her continued idol activities. She handles practical aspects for the group, like scouting locations such as her family's properties. After the third-years graduated, she became vice president of the Idol Research Club. Maki's development centers on transitioning from isolation to forming connections. Early on, she had no friends visiting her home, as noted by her mother when Hanayo visited. Through μ's, she overcomes her reluctance to express vulnerability, seen in moments like visibly enjoying the beach outing in Season 2 Episode 11. Her relationship with Nico evolves from frequent clashes to a nuanced friendship. By the series' conclusion, she balances her commitment to μ's with her family's expectations, vowing to continue as an idol while acknowledging her responsibilities. Physically, Maki has shoulder-length red hair, purple eyes, and a slim figure. Her height is 161 cm (approximately 5'3"), with measurements of B78-W56-H83. She favors tomatoes as her preferred food but dislikes tangerines. Her diary entries reveal internal conflicts about her predetermined path, a longing for self-discovery, and details of daily routines like practicing choreography or balancing idol activities with studying.