Rion Aida is an 18-year-old Japanese girl, who's the only daughter of Gozo Aida, a 51-year-old salvaging company president. She hopes to continue the family business in the future.

Rion has chestnut brown, almost shoulder-length hair, with a red hairband & brown eyes. She also has medium-sized breasts. She wears round eyeglasses, a yellow waistcoat over a white sleeveless dress-shirt, a green, short pleated skirt & red stiletto ankle boots with yellow bows on them.

Rion has been described as spunky, tough & competent, with a knack for getting into dangerous situations & finding resourceful solutions. She has a habit of getting on peoples nerves sometimes.