Marie is an easily angered, intimidating, and rather tomboyish girl. She has a very frightening personality, perhaps best exemplified in "Key to My Ed" when the presence of her and her sisters manages to stop a rumble and scare everyone away from the Lane.

Marie wears a black tank top that stops right above her midriff, a pink belt, green non-camouflaged BDU pants, a dark green wristband on her left arm, and black shoes with gray soles.