Unicorn City: Marsha

There were a lot of great characters in the film, but she was the best.  When I first saw her my reaction was, "Great, another hot-girl-plays-unconvincing-nerd role."  But her character manages to be SO believably nerdy, but at the same time so likeable and appealing, that you really want her to win in the end.  I don't know if I've seen that pulled off so well in a film before.