Yep i create a different personality for each of my characters and I choose the choices that they would pick. I also try to develop that personality over the course of the game.
pretty much what i do. it's fun watching your characters grow throughout the story.
the classes that i enjoyed the most out of the one's i've currently played (all but SW and IA) would have to be smuggler and jedi knight. i played my gunslinger snarky and a tad greedy, but she was a softy too. my guardian was dutiful, but did have a sense of humor.