Ai was Forbessi's fiance, until Forbessi married Sage in the normal timeline. Ai is a fair lady, and her resemblance to Nerine made other characters believed she was Nerine's mother, determined from her hair colour, measurements, and grace. She is well-educated, graceful and gentle. She always talk in a big-sisterly manner, even to the people older than her (e.g. Forbessi) (Source: Wikipedia)