Empire- Anakin and Palpatine (I don't really like Vader for some reason)
Republic- Anakin, Kit Fisto, and Aayla Secura
CIS- Darth Maul and Asajj Ventress
Rebels- Obi-Wan and Luke
Some of my choices might not seem like they're on that side, but they are for least for one level. Some may have to be dowloaded.