Lachlan Haines
Lachlan Haines was part beaver, part human, and all idiot. He grew up thinking his teeth could beat fire, so he bit through a whole mountain. He saved everyone, but he was still the most retarded person in history. He had a brain the size of a pebble.
He bit the mountain and then cried because he had no teeth left.
He tried to fight the fire nation with a spoon.
He saved the world, then took a nap and forgot about it.