Characteristics all the way. you cant really ''buy'' them post character creation. But to offer an opinion to your question, I would say look at your characters background and story, does he have military experience in his history? if so ranged or gunnery might be good. was he raised in a neglectful family and spent much time providing for himself as a child? streetwise and survival would make sense. Has your character seen some degree of horror in his time and isnt shaken up by much as of late? cool or presence might make sense.. the great thing about this game is how story driven it is. So long as you ''know'' you character well, you will know what skills or talents would make sense for him/her to possess. If you are just looking for the skills that will provide the best chances with every roll, then just beef up the areas you think you will be using the most. ranged light or heavy are never a bad idea because no matter what your career or backstory sooner or later blaster bolts will be flying.