Ok, i just picked this game up and I was wondering, if I chose to be an ass on this game by selecting the "bad" voice lines, does anything happen to my character that makes me "bad or dark" like on previous Bioware games like Star Wars Knights of the Old Republic?

Or does it just enable and disable different plots with characters?

Thanks much!

While your appearance does not change by being either a renegade or a paragon, quest options will pop up and character interactions differ depending on how you respond to them. In addition, acting like a renegade will give you renegade points while acting like a paradon will give you paragon points, which open up further specialization in intimidate and charm skills, respectively, which give you dialogue options unavailable to characters with lower ranks of these skills. They allow you to negotiate better rewards and even solve otherwise impossible scenarios both on side quests and as part of critical missions.