Lieutenant Dax from Deep Space Nine. She's a veritable genius, holds her own with Klingons and Ferengi, has 300 years of life experience and confidence, and wears a full uniform most of the time! Most of the women on Trek are on an extreme end of the passive/agressive scale. Janeway isn't agressive in a violent way, but in a lot of the stories, she's a prime example of a woman who's so taken with her power that she won't listen to other people (when she DOES give in and do what her male first officer says, the problem gets solved). In fantasy, there's a great heroine in The Deed of Paksenarrion, by Elizabeth Moon. EDIT: Part of the lack of ... not realistic, but admirable heroines is that a lot of girls don't go out and watch scifi movies, like someone up there said. IMO that's because, for the most part, there's nobody for them to identify with! Aside from Ripley, I RARELY come out of a scifi movie ADMIRING the heroine.