Madoka Aoyagi is a supporting character in AOKANA: Four Rhythm Across the Blue. She is a student at Kunahama Institute and the younger sister of Shion Aoyagi, a key member of the school's Flying Circus team. Madoka shares a classroom with Asuka Kurashina, Masaya Hinata, and Misaki Tobisawa, and she serves as the manager of the Kunahama Flying Circus club. Her role in the story is primarily that of a diligent and energetic supporter who handles the club's organizational tasks behind the scenes, allowing the main athletes to focus on their training and matches.

Personality-wise, Madoka is lively, outspoken, and responsible. She tends to speak her mind directly and approaches her duties with enthusiasm. Although she does not possess the same level of natural talent or prominence in Flying Circus as the main heroines, she harbors a strong desire to one day become a central figure in her own right. Her internal motivation is captured in her expressed wish to be the main heroine too, and she holds onto the belief that her own moment to shine will eventually arrive. This aspiration drives her to work hard and never give up, even when she feels overshadowed by the more gifted athletes around her.

Madoka's key relationships include her brother Shion, with whom she shares a close sibling bond, and her classmates, particularly Asuka, Masaya, and Misaki, whom she supports as their club manager. Her dynamic with the team is one of friendly encouragement and practical assistance. Over the course of the story, she does not undergo a dramatic character transformation but rather maintains her steadfast optimism and commitment, serving as a reliable anchor for the club. Her notable abilities lie in her managerial and organizational skills, which keep the team running smoothly, rather than in any exceptional flying talent. She is physically of average height and build, with light blue hair and purple eyes.