Oh man, I love this idea! I think Thor would be a rad firebender as well, but he’d use lightning, right?? And Hawkeye as an airbender maybe. Ooh Natasha as an airbender for sure, with those wicked flips and spins she does. Amazing. And I vote for Cap to be an awesome nonbender. Loki bends water/ice, duh. Bruce as an earthbender?