I love the show so much. This is definitely an original look at writing fanfiction, enjoyed your writing quite a bit.
By the way the writer of the show recently wrote a couple of books, maybe you would be interested. They are not set in the Avatar universe but made me feel right at home anyway. The first book is called Rebel Genius, you should give it a try.
RE: Avatar: The Lost Legend --Chapter 1, The Boy in the Apartment