Maria operates as a Shin-Yokohama vampire hunter affiliated with the Vampire Hunters' Guild. Her primary occupation is that of a Matagi, a traditional bear hunter, working from her Mt. Tanzawa hut. She earned the epithet "Bear Killer" through this role. Her path to vampire hunting began after successfully exterminating a lower vampire in the mountains, convincing her of her capability for the work. She sports light brown hair: bob-like at the back, bangs covering her forehead, and long strands reaching her upper chest. Her eyes are sharp and dark brown. Her attire resembles a modified nun's habit: a long strapless dress, black outside and blue inside, featuring a white chest panel and a slit to the upper thigh. She wears a short white cape coat with an upright collar secured by a silver cross above her collarbones. Additional elements include long white gloves with metal plating over hands and knuckles, black thigh-high stockings with white tops and garters, and metal stiletto heels with toe coverings. Personality-wise, she exhibits a lively, tomboyish, and sisterly demeanor, demonstrating little concern for public modesty regarding nudity or undergarments. She holds second place in the Shin-Yokohama Hunter popularity rankings. She chose her nun-inspired attire believing traditional hunter gear wouldn't garner sufficient respect. She participates in cases and guild activities alongside colleagues like Satetsu, Shot, and Ta Chan. Her blood type is B.