Maria is Rosa's daughter, and is the youngest of the cousins at nine years old. She has a habit of uttering 'uu-uu' at times, which frustrates Rosa greatly. Maria is also rather stubborn, and believes things easily, which isn't uncommon for someone her age. She has an interest in the occult, like her grandfather. She carries around a bag which is filled with occult items, such as a scorpion charm which wards off evil. She idolizes witches, and believes that they are there to bring people joy and happiness. In Maria's notebooks there are sketches of witches, and the witches are beautiful, fantastical creatures. It upsets Maria greatly when someone denies the existence of witches, especially Beatrice's existence. At certain times, Maria undergoes a personality change, and begins to laugh in an unnerving fashion. When she is in this mode, she acts rather condescendingly with regards to things about the occult, and will often call people like Battler 'stupid' for having little to no knowledge of such things.

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