Well, for me, one of my top favorites is of course Sailor Moon. It was one of the first animes I watched as a fan way back when I was 11. She brought me into an interesting world of sailor uniforms, bentos, kyoiku mamas, Tokyo Tower, the odango/meatball hair style, and so on. To me, she just defined anime at the time. The series in general showed me what students in Japan go through and so on.