Ayumu Uehara begins as an ordinary second-year Nijigasaki High School student without exceptional talents, leading a typical high school life. Her path shifts dramatically after witnessing a school idol performance alongside childhood best friend Yu Takasaki, sparking Ayumu's interest in becoming an idol despite lacking singing or dancing experience. Official media depicts distinct inspirations: in the All Stars continuity, Ayumu initially becomes an idol because Yu loves them, later realizing her own passion and choosing to continue independently. In the anime, she pursues idol activities from personal desire but reconsiders when Yu seems distant, ultimately affirming her self-motivated passion and the endurance of their friendship on separate paths. Ayumu is hardworking and diligent, dedicating full effort to her activities. Persistent insecurities about her "ordinary" singing, dancing, appearance, and abilities form a core struggle, explored in solo songs and story arcs. She is kind, cheerful, friendly, somewhat shy, and prone to clumsiness. Her pure-hearted nature leads to innocent responses to teasing from peers like Karin Asaka and Kasumi Nakasu, often disarming them unintentionally. Ayumu exhibits deep protectiveness over her relationship with Yu, sometimes feeling jealousy when Yu interacts with others or expresses indecision about favorites. Humorous, satirical portrayals occasionally exaggerate this possessiveness. Her hobbies include Pokémon, fashion studies, and video games, where her perseverance makes her unexpectedly skilled. She is semi-fluent in English and owns a pet snake named Sasuke. Ayumu has orange-pink hair typically tied in a side bun featuring a small braid and hairpins, yellowish-hazel eyes, and a slim figure. Her image color is light pink, reflecting her gentle demeanor. The etymology of her name—combining "walk" (歩) and "dream" (夢)—mirrors her step-by-step approach toward goals. Across all media, Ayumu evolves from dependence on Yu's presence to embracing her individual identity as a school idol. She consistently emphasizes energizing others through live performances, aiming to unite with audiences and create joy. Her development underscores themes of self-acceptance and balancing personal dreams with enduring friendships.