Angelina Nanatsu Sewell, also called Ange, attends Yuihime Girls' Academy as a second-year student. Born and raised entirely in Japan to a Japanese father and British mother, she speaks only Japanese despite her British lineage. Her mother's profession as a maid shapes Angelina's own career ambitions and personal style. She forgoes the standard uniform, always appearing in a maid outfit and identifying as a "stray maid" seeking a worthy master to serve, reflecting her dedication to becoming a professional maid.

Cheerful, energetic, and kind, Angelina often refers to herself in the third person. She excels at housekeeping, cooking, and cleaning, but faces significant challenges in academic subjects like English and mathematics. Her favorite food is tokoroten. At Yuihime, she actively assists male transfer students from Kagamidai Academy, particularly focusing on Shingo Uryū as a potential master candidate, driven by her inherently helpful nature.

Within her visual novel character storyline, Angelina eventually becomes Shingo Uryū's personal maid, addressing him as "master." Their deepening relationship leads her to move in with him, sharing daily routines including morning kisses, and culminates in marriage where she adopts the surname Uryū. Post-marriage, both become teachers at the school, and with Shingo's support, Angelina establishes a maid training class. This narrative is exclusive to her route in the original PC game. The anime adaptation briefly depicts her role as Shingo's maid in Episode 5, though this dynamic does not continue beyond that episode. Her journey progresses from a "stray maid" seeking purpose to a fulfilled professional and partner.

Physically, she stands 155 cm tall with light green hair, violet eyes, and body measurements of 90-60-89 cm. Her blood type is B, and her birthday is August 8, placing her under the Leo zodiac sign. These attributes and her background, personality, and narrative progression remain consistent across all portrayals.