Rei seems to enjoy her parent's affection, she is a joyful child, but somewhat clumsy, She was also noted for not being particularly strong and healthy for her age, Ri Shin noted that not only does she look like her father but she also possesses his spunk as well.
She possesses short black hair and bears a certain resemblance to her father.
Rei was born a few months after the Coalition invasion was repelled. One year later, she was seen playing joyfully with her happy parents as she begins to learn how to walk.
During the siege of Kanyou city, She, her mother, and You were targeted for death by the agents of the Ryo Fui Faction within the state of Ai forces.