Aoi Asada attends Satogahama High School as a second-year student and becomes a member of the girls' baseball team. She often lacks tact and habitually invades others' personal space, yet possesses a strong aptitude for detail-oriented work. Her speech consistently concludes with the particles "no da" or "nano da."

Physically, she has lilac hair, blue eyes, stands 1.58 meters tall, and weighs 46 kilograms, with measurements of 78-59-75. Her birthday is February 22 and she has blood type B.

On the baseball team, she starts as the third baseman before transitioning to second base. She bats and throws right-handed, wearing jersey number 4. Outside of baseball, she is known for being exceptionally skilled at rock-paper-scissors.