My favorite character so far is probably Tarrlok and Bolin. Tarrlok because of the sheer badassery / craziness, and Bolin cuz he's hilarious :P
Korra's kinda dumb sometimes -.- but she's p cool too
I feel like, Amon could be his brother... who is either a non-bender with chi powers, or a waterbender who has figured out how to use Bloodbending to take away bending powers. I mean, when Amon takes away ppl's bending, they kind of freeze and quiver, which looks kinda like Bloodbending... but who knows? Damn, I'm so excited for the next episode :<