DB - Ivanova (B5) because Susan is still my all time favourite female in Sci-Fi TV and she kicks ass (usually PsiCorp ass).

Rails 1 & 2 - Elladan and Elrohir (Tolkien) Why should Arwen get all the love? How about her [could be] twin brothers?

Originals 1 & 2 - I am torn between Romulus and Remus (originators of Rome) and Luke and Leia (because it's the ORIGINAL trilogy).

I don't really have anything for the last two, but hate to be incomplete...

Storage - Hermione(HP)
Switch - Uhura(ST)

Lame they may be, but hey, I had some fun thinking about it. :)