Natsumi made a pretty terrible first impression on the Reserve Course students—she came across as smug and full of herself from day one. According to the Twilight Syndrome Murder Case, she had a nasty habit of deliberately stirring up resentment against anyone she didn't like or felt threatened by. Her parents apparently thought she was meaner and tougher than her brother, and frankly, they saw her as more cut out for running the family's yakuza business.
Fuyuhiko remembers her as someone who loved messing with him and could drive him up the wall, though he's always been protective of her anyway. At the temple festival, her fried noodles were such a draw that crowds would actually line up around the building. She also racked up endorsement deals with hand towel companies almost absurdly fast—which probably says something about her charisma, even if it was the annoying kind.
She was fundamentally self-centered and arrogant, but what made her dangerous was how smoothly she could manipulate people into doing what she wanted. She didn't need to throw tantrums; she just had a knack for getting her way.
Content compiled by AnimeList.moe from publicly available sources.
