Rosaria is a somewhat intimidating woman who has a rather unorthodox idea of piety. She dislikes topics that bore her and having to work overtime. Despite her position in the church, Rosaria is the least devout; she is always guaranteed to skip all church activities when possible and the first one to leave if she is forced to attend. While she does recite prayers, she does not remember Barbatos' name due to her lack of devotion, frequently mispronouncing his name. Secretly, she’s an assassin.