She has a long-standing habit of uttering the phrase "uu" whenever excited or upset. She is very honest and naive, as shown by her tendency to easily believe lies and take jokes very seriously. Having no interest in friends or studies, Maria has an extensive knowledge of the occult. There have been instances, usually when Beatrice or the occult is involved, where she acts very creepy, often denoted by her distinct laugh, "kihihihihi", which unnerves anyone who hears it. She believes avidly in Beatrice's existence, and gets mad at anyone who questions it; she even claims to have met and played with Beatrice on occasion.