Mary is a slim 5'9, 18 year old girl with an average bust. She has long black hair, parted in a manner that covers one of her hazel eyes. She tends to wear black clothes.
Mary is a rather shy person, barley able to make a sound when met with someone new. In these situations, her navi does the talking. Of course that is only when they are in person, otherwise Mary is a bit more talkative, but still quite shy. If one manages to talk to her long enough, they might find out that Mary has an interest in architecture.