Marcy is a friendly, geeky, intelligent, resourceful, and intellectual girl; she's always shown intently researching various subjects and taking notes. She has always received straight A's in school, implying her above average intelligence, except for Gym due to her reading during her class. She is curious and takes interest in different cultures, being the one who discovered the Calamity Box. She is also intuitive. Anne mentioned she was oblivious because she was "unaware of her surroundings."