This is sad and lovely: I especially like Zuko wondering if airbenders had - or have - light, birdlike bones. And the parallel between Zuko and Aang in terms of defining facial markings is one of my favourite of the tricks the series used, and yet I can't remember ever having seen it used explicitly in fic - so your last line was awesome.

Also: oh, mini!Azula... And also mini!Zuko, though I have to say you give your Zuko a lot more credit at that age than I do, I think. But, hmm, he was I suppose a sweet kid - and I like the idea of him being solicitous enough even to wonder just how it was that the Airbenders used to honour their dead.

And just generally I love the (essentially canon!) idea of Zuko tearing himself up inside and thinking deep thoughts while heading off into a blizzard. Oh Zuko.