In His Element(s) (джен)

"“So… one more time.” Shouta pinched the bridge of his nose, regretting both waking up this morning and possibly existence in general. “You’re the spiritual avatar of an entirely different world, and in the process of keeping the peace with said spirits, originating from your… dimension, you’ve come to our world to stop the actively malicious versions of your spirits, because our world told your world that something was wrong.”
The child shrugged and grinned, looking much too cheery for someone currently in handcuffs.
“Pretty much!” he chirped. “Your world spirit is really polite, too. Ours was super grumpy about all the spirits escaping, but then yours said it was ok, so long as I teach her more about them on the way back!”"
 
Aang chases some renegade spirits across worldly borders and possibly makes some new friends along the way.