An
a Lucia
Continuing from the discussion in the last thread, I don't believe that we'll see her being a cop, in her back-story (nor SWAT, either)! I think she's an Army brat... Maybe her dad was special forces, or something, or maybe she had a gang background (although I doubt that).
She knew about the old military tang imprint, so that (and her "tough-guy attitude") suggests a military background. She also obviously knows something about weapons, and melee/unarmed combat.
She was NICE, when we first saw her, in Jack's flashback, in season one, and she was pretty nice in the early parts of the last episode, too. I think she'll also be nice in her own flashbacks, and hopefully they'll reveal something about her background...
I don't expect her to try to take over Jack's role as leader, but I DO expect her to give him trouble, and call him on all the stuff that HASN'T been done! I also expect to see some romantic interest, not with Jack, but with either Sawyer, or (after some initial love-hate) with Sayid! The former is more likely than the latter, at the moment, as Sayid is going to have to be angry with her, for a while, and doesn't strike me as the most forgiving type!
We'll see...