Maria is Nagi's maid and basically her older sister—though she acts far more mature than any seventeen-year-old should, which means everyone around her, even people close to her, treats her like she's way older than she actually is. She hates this. Her go-to response when people forget her age is "I'm still a fresh seventeen year old."
She's the most sensible person in Nagi's orbit, though her grasp on money is just as warped as Nagi's, which is saying something. Basically everyone in the manor answers to her—the head butler, the security detail, all of them—because they either respect her judgment or are genuinely intimidated by her. Probably both.
Maria's got real skills: she's intelligent, good with her hands (housework, self-defense), loves games of every kind, and has a devious streak. The one thing that completely undoes her is cockroaches, which she's absolutely terrified of and refers to only as "the dark life-form." She's also notoriously bad at disguises; whenever she tries to spy on Hayate and Nagi, she gets spotted immediately.
She became Nagi's maid after starting as her tutor, and honestly, she's one of the few people smarter than Nagi—which is exactly why Nagi insisted on having her as her only maid. Maria also made history at Hakuou as the youngest student council president ever, elected at just ten years old in her first year.
The catch? Despite her intelligence, she has zero clue about normal life. She didn't even know trains came in varieties other than bullet trains.
Content compiled by AnimeList.moe from publicly available sources.