Care if I join? If so, I'd have to go with the Water Tribe. I've always had an affinity with water, plus I'm a Picses whose real name (Dylan) means "of the sea". The name originating from a God of the Sea in Welsh mythology. So I've always found water fitting. Though, if you saw me, you'd probably think I'd belong to the Earth Nation (thanks to my physic). Going through this groups posts, I kind of surprised no one's discussed the finale at all. I gotta say, I just love the brutality behind Suyin's takedown of P'Li. Very reminiscent of Combustion Man's defeat at the hands (boomerang) of Sokka.
If I think of anything interesting to put here, I'll let you know.