BF2 is the game where you can use different Jedi's and Sith's. They only get to be playable charcters once you've accomplished a certain amount of goals. Then a message will appear on the screen asking if you'd like to be on the major characters. As far as I know they never get to be playable at anytime. Sorta sucks but it would definitely unbalance the game if there was a Jedi running around a level filled with nothing but stormtroopers.