Episode I - Padme Amidala (Battle of Naboo)
Episode II - Padme Amidala (Arena Battle)
Episode III - Padme Amidala (...okay she didn't wear anything memorable, probably Obi-Wan)
Episode IV - Leia Organa
Episode V - Leia Organa (Hoth Echo Base)
Episode VI - Leia Organa (General)
Episode VII - Rey (Jakku)
Episode VIII - Rey
Rogue One - Jyn Erso
The Clone Wars - Ahsoka Tano (later series)
Rebels - Hera Syndulla
I am doing a solely heroine/droid display from each movie. So I currently have HT ANH Leia with R2 and 3PO, and Rey with BB-8, with Jyn and K-2SO on order. I will add Hoth Leia and VIII Rey, and hopefully a Leia from ROTJ and Rey from IX when the time comes.
I wouldn't mind adding Padme if they ever make one, and I wish Sideshow would make Rebels and more Clone Wars figures.