Sanzenin, Nagi

三千院ナギ

Nagi is the sole heir to the Sanzenin fortune. She is not merely your typical "rich girl." To call her simply "rich" would be an understatement. The "Sanzenin fortune" is so vast that discarding 20 trillion yen in a red herring investment is regarded as a prank.
Nagi is short-tempered, spoiled, and anti-social or socially withdrawn. She hates losing and admitting her faults, and she has considerable difficulty confessing her true feelings toward Hayate or anything else for that matter. She often acts immaturely but is ultimately a good, educated girl. She is skilled in finance and enjoys learning. Her mind is her own. She cares for her family and friends, but she does not wish to show her concern directly. She usually tends to express her concern with "formal words." She is a tomboyish, tsundere hikkikomori princess. Since going outside is very dangerous due to her status, Nagi prefers staying at home. Disliking company in general, she lives away from her grandfather in a "small" (compared to the main Sanzenin estate) mansion with minimal staff. Despite her Otaku NEET-like lifestyle, she is intelligent enough to skip three grades at school, which even turns out to be one of Tokyo's most prestigious academies. She has an otaku-level hobby involving manga, anime, and video games, and she draws her own manga.
Her Otaku level is high enough that she has submitted entries for multiple amateur manga competitions, though her entries never won.
Her only surviving family member is her grandfather, whom she dislikes, so she regards Maria as a mother or older sister figure, and warns Hayate not to touch Maria in any indecent way or she will never forgive him. She has a crush on Hayate, and has misunderstood Hayate, thinking that he loves her.