Misao Aoki is a third-year student at Seiin High School, serving as both vice-captain of the boys' volleyball team and vice president of the student council. Standing at 193 cm (6'4"), he is the tallest member of the volleyball team. He has brown hair styled in a side part, with strands falling over his forehead, and dark blue eyes. On the court, he wears the team's navy blue jersey featuring sky blue and white stripes, displaying the position number 2. Off the court, he typically wears his school uniform, often including the blazer.

Aoki possesses a practical, systematic nature, valuing structure and organization. He is reliable and responsible, demonstrating a strong sense of duty toward his team. His leadership involves meticulous observation and attention to detail, enabling him to identify areas for improvement and develop strategies. A notable trait is his admission of "ulterior motives," kept secret from others, which manifest in actions like deliberately losing matches or recording conflicts for undisclosed purposes. Despite this secrecy, his actions consistently align with the team's best interests, making him an ultimately positive influence.

His relationship with team captain Shinichiro Oda highlights their contrasting personalities. While Oda embodies pure intentions and emotional support, Aoki acknowledges their differing approaches, describing their partnership as an "odd friendship" due to his own hidden agendas. This dynamic, however, does not diminish their mutual respect or close bond. Aoki's loyalty is evident in his refusal to abandon those who believe in him, underscoring his commitment as a stabilizing presence.

Beyond his height advantage, Aoki contributes significantly through his strategic mindset and observational skills during matches. He acts as an emotional anchor during team conflict or instability, reinforcing his importance to group cohesion. In his first year, his hair was worn flat with bangs covering his forehead.