[Here's some of the Avatarstuck character ideas. I won't name them all, but... some.
Aang- John
Katara- Jade
Toph- Terezi
Fire Lord- Bec Noir
Azula- Vriska
Zuko- Karkat
Uncle- Kanaya maybe
Sokka- Gamzee
Suki- Nepeta
Mai- Aradia
Ty Lee- Feferi
And that's it so far... If you guys got any more characters, let me know!]