A specific character? Hrm. I have no idea. I don’t think I would particularly want to be anyone else, I would quite like to just be me, but in the Avatar world.
If I really had to choose one though… Maybe Toph? Not so much the Earthbending or the whole parent dilemma. But the idea of being rich as fuck and a badass person is quite appealing. Gurl had a good life, I wouldn’t mind stepping into her soleless shoes for a bit.