Maria is a major character in the game, serving as the family maid, as well as the personal assistant and lover of Alfred Drevis. Maria is very loyal to Alfred, and is willing to risk her life to save him from his late-wife, Monika Drevis, who has returned as a vengeful ghost.

Maria is a very kindhearted woman who's most notable trait is her trust and loyalty. She becomes fully devoted to those that show her kindness and treat her well, regardless of what kind of individual the person may be. This is due to her feeling unwanted and unloved for most of her life. However, if one betrays her trust, Maria loses all loyalty she had to the one who betrayed her.

Maria's diary reveals that she's a bit insecure about her eyes, as she notes that a young boy ran away crying upon seeing her face. She also notes that Aya seems to be scared of her as well ever since their first meeting, though she also mentions the possibility that the young mistress simply hates her after the young girl found out about the affair the maid has been having with Alfred, Aya's father.

As revealed in the 2020 remake, one of Monika's hobbies appear to be dart-throwing, as she has a dartboard in her room. It's very possible that this hobby of hers has helped improve her frightening accuracy and deadly precision when she throws knives at faraway individuals.

Despite being the family maid, Maria's character profile describes her as a freeloader, which may imply she only really serves Alfred when he requires her assistance, and mostly loafs around otherwise.