Once upon a time, somebody commented that
Gyendal in a hood apparently looks like
Zuko in a hood. And after a while, I noticed that other than the color-scheme and minor design differences,
Gy's regular outfit looks sort of like
Zuko's gAang outfit. D_A-verse-TDP-Gy really pulls the Emo-Zuko look awesomely.
Also.
WHEN I SEE TOPH YOU CANNOT TELL ME SHE DOESN'T LOOK LIKE MEL SO THERE!!! Crossover for the lulz! WOOHOO
It's surprisingly fun. And I totally forgot how to draw Gyendal earlier, so now he looks a bit too young. Bleerp

And the rest of the cast cannot fit anywhere, and the best I could do to force everything to fit is put Ulf as Aang and Galahad as Iroh and makes absolutely no sense so I'm leaving you with just this.
Watch out for the Aveyond/Legend of Korra one. It's 0ver 9000 times more epic than this.
ETA: Funny thing about this? Toph and Zuko's relationship is actually more of... well, NOX and Gyendal's relationship in my headcanon. Gyendal and Mel are more like Zuko and Katara before she stops being all ticked off at him. 'cept that Mel looks funny in Katara's dress. Seriously

Now that I brought Agas in the other picture, I suddenly want to draw how Agas do his magic post-AV1 in my AUland... It's eerily similar to how bending works in Avatar. 'cept it's not tied to any element.