I think a character that grabbed me from the first time I read about her, within the last few years, was Sienna. She was so shy and sweet and normal. Not drop dead gorgeous like Anya or Gwen. Then BAM! She's working for the hunters and out to get Paris, one I the yummiest guys ever! She grows so much as a character, completely justifying my obsession with her. I mean, wait, no spoilers!! Look where she ends up!!