She has a black ponytail and is often seen wearing a white naval uniform with a school swimsuit underneath, as well as an eyepatch that helps regulate usage of her magic eye. She is a part of the 501st Joint Fighter Wing, with the role of Major. Her affiliation however is the 288th Fuso Air Force, along with Miyafuji Yoshika.
Her first Striker Unit was a A6M3a type Zero with with blue stripes on the vertical stabilizer as well as a blue angled stripe that points downward at the front and upward at the back as it's identification stripes. Her second unit is based off of the Kawanishi N1K-J Shiden (Violet Lightning)) with a single white angled identification stripe after she started becoming unable to raise proper shields once she reached the age of 20. She also forged a new katana that she calls Reppumaru, that has the ability to redirect Neuroi energy beams back to the enemy.
Mio is based on Japanese flying ace Sakai Saburo.