Michinari Akagi, a third-year student in class 3-6 at Inarizaki High School, serves as the starting libero for the volleyball team, wearing jersey number 15. Standing 174.2 cm tall and weighing 70.8 kg, his athletic build supports his defensive role. His name, inspired by the red fox, reflects the cleverness and quickness evident in his gameplay. Akagi sports dark, spiky hair often swept to one side, large eyes with small pupils, and thin eyebrows. Post-timeskip, his hair appears shorter while maintaining his overall look. Despite his athleticism, he harbors concerns about his increasing body fat percentage. His favorite food is string cheese sticks. As Inarizaki's libero, Akagi showcases exceptional defensive skills, excelling at serve reception and digging. He consistently handles powerful serves from opponents such as Tobio Kageyama and Asahi Azumane. His quick reflexes allow for unconventional saves, including using his foot to keep the ball in play during a critical rally against Karasuno High School – a move that impressed opposing libero Yū Nishinoya. His coordination with blockers further enhances his effectiveness in receives. During the Tokyo Nationals match against Karasuno, Akagi exhibits leadership through vocal encouragement, frequently urging teammates to "fix our rhythm." He remains focused under pressure, though visible frustration surfaces after difficult plays. His emotional investment becomes clear as he crouches in distress following Inarizaki's loss. Akagi maintains strong bonds within Inarizaki, addressing teammate Shinsuke Kita by his first name, indicating familiarity. He collaborates directly with setters like Atsumu Miya during matches and actively participates in strategic discussions during timeouts. After graduation, Akagi becomes a physical education teacher at a high school in Hyōgo Prefecture. He continues following sports, traveling specifically to Onigiri Miya to watch Olympic events.