TV-Series
Description
Ai Asato, commonly addressed as Maria, serves as a patrol officer in the Transport Department at Katsushika Police Headquarters. Born in New York to martial artist Ban Asato and Kyoko Asato, she has an identical twin sister named Rin. Before joining the police, she achieved recognition as a male Muay Thai kickboxing champion under the name Ryuji. Unrequited feelings for her martial arts coach, who departed abroad before she could express them, coupled with Ryotsu Kankichi's resemblance to that coach, motivated her career shift into law enforcement to be near him.

Maria stands 169 cm tall with measurements of 93.5-58-88 cm (bust-waist-hips). She has long, straight dark brown hair (often depicted as black in manga) with blunt-cut bangs and hip-length ends. Her eyes appear amber in manga color illustrations but darker brown in anime. Her standard attire is a distinctive lilac-colored police uniform featuring a long-sleeved coat, skirt, matching shoes, and official hat, switching to short sleeves in summer.

Personality assessments indicate ISFJ and Enneagram Type 6w7 traits, reflecting loyalty, responsibility, and anxiety. She exhibits traditionally feminine mannerisms and speech patterns, using the pronoun "watashi." Her demeanor combines compassion with intense jealousy, particularly regarding Ryotsu's interactions with other women. Despite her nurturing nature, she retains formidable martial arts skills from her kickboxing career, which surface defensively or in anger.

Key relationships define her character:
- Her obsessive affection for Ryotsu manifests through constant hugging, use of the honorific "Ryo-sama," and decorating her living space with his imagery. This possessiveness often leads to physical confrontations when she perceives romantic rivals.
- She maintains a close friendship with Reiko Akimoto, sharing interests in cooking, sewing, sports, and modeling. Their dynamic positions them as complementary "beauties," contrasting Reiko's blonde-haired, blue-eyed appearance against Maria's brunette Japanese features.

Character development diverges between continuities:
- In the manga, an initial temporary gender change occurs via celestial intervention in Volume 75, later reversed. A permanent magical transformation into a biological woman takes place in Volume 111, prompted by competition with love rival Haya Isowashi.
- The anime adaptation presents a non-magical transition involving hormone replacement therapy and breast augmentation surgery, with her preoperative status a recurring plot point. Characters typically refer to her with feminine or neutral pronouns regardless of continuity, though Ryotsu occasionally references her past.

Her professional background as a martial arts champion provides exceptional combat capabilities during police work, occasionally surfacing comedically when jealousy toward Ryotsu's potential love interests triggers aggression.