Mary is Claire's best friend. Sometimes, Mary gets nervous when it comes to events or giving reports, usually making her look like a fool. Mary also sometimes gives advice to her friends on how to pick up guys, since she's dated a lot of guys herself. She's kinda picky about how to do so, though. When Claire asked Jim out to the dance, she thinks it's logical to have him ask her, saying that there are rules to being on top of the "social food chain". In later episodes, Mary starts to become suspicious of Claire's secret life and has become determined to find out what's going on by any means necessary. Despite this, Darci believes otherwise and won't listen to Mary.
Mary is a tall Asian-American female. She has long, black hair and pink eyelids. Usually, she wears a striped green shirt, but sometimes, she wears a red one.