Yeah, there's some really fun stuff in this thread.
In terms of background, my Seladrine ranger will be one whose job it is to hunt down Lolth-sworn drow who are escaping to the surface. She's genuinely a good person who defies Lolth on principle, but she's still haughty and arrogant, viewing other races with a degree of condescention. She's also got a bit of a ruthless streak. Not to the point of crossing the line to evil, but she's willing to make a few ethical sacrifices and not lose sleep over it. If the goal is important enough, she'll employ sketchier methods.
I should probably think of a good backstory for my tiefling.