Mary is generally good-natured, but can sometimes be a little rough around the edges. She's been known to be too honest at times, not really thinking about the repercussions of her own words. She also has a problem facing responsiblity, depending on the situation. After her creator decided she wasn't worth raising (when she was about 13), she was dumped on the streets to fend for herself. Having almost given up hope, she met Fred. What happened between that point and their introduction to Snappy Willows Mental Health Center, a branch of Snappy Acres, is unknown.