Prince Zuko's story is the main ... but mostly serious when speaking to Aang, probably because he feels responsible for the 100-years war that his best friend Sozin started. It's unclear if ...

He can only slowly try to peel back Zuko's trauma ... is hosted by his old friend Bumi, who he knew 100 years ago when Aang visited Omashu. I think Bumi was handled as best as can be expected ...