Fiona is a pale woman of above average height for her age with bobbed hair of a light lavender color and a long fringe covering much of the right side of her face, worn swept behind her left ear. She has cold purple eyes framed by light-colored eyelashes, and most often is seen wearing an emotionless expression. She is described as beautiful by Yor Forger. Fiona is introduced wearing a duffel coat with a black turtleneck and pants underneath, and her outfit when visiting the Forgers' house consists of a black blazer and a low-dip light shirt. Her stud earrings take the shape of WISE's symbol,which is her affiliated institution.