Aiko is a pale Japanese girl of light build. She has red eyes, black hair, a red hairpin, and usually wears a red cotton sweater with a dark red skirt, long socks and black shoes.
Aiko's worker outfit is a pink long-sleeved shirt with cyan overalls with a pocket in the front and yellow buttons. She also sticks her hair back while using this outfit as she's working with machinery.
Aiko is an intelligent, though humble, calm and mild-mannered person. She's a little uptight and distant but is sure to help out those around her.
Aiko's family are his parents Eiji Hyodo and Emi Hyodo, and would eventually become the great grandmother of Bretan Harwell.