Well, one thing that makes me different from Mary is that I didn't fall in love with a villain and turn evil, but that's probably not the answer you're looking for.

Perhaps she's a little bit more outgoing and in charge than I am. I'm usually not the highest ranking person in the room, so I tend to try and blend in to the background. Mary on the other hand would put herself in charge immediately. I have a heart attack any time I'm put in charge of choosing anything by myself. Whenever my siblings are away for the day, my parents will purposely call it My Day and try and make me decide something special to do for the day because they know I'm indecisive.