Sokka and Katara are integral to the gang's dynamic.
Zuko and even Toph are not.
>>121357957Bryke, Ehasz, and Jack himself have all said Sokka wasn't even conceived or written as the funny one until they were dubbing an early version of The Boy in the Iceberg. That it mostly sprung from the voice over. He was more or less a regular everyman in his original character concept.
Lucky for Sokka, because we all know what happens when Bryke dream up your character to be a fucking Joke from the beginning.
