Hey there!
I think the plot of your fan-fiction is good, and I can't help but admit that it IS one of the best avatar fan-fictions I have read so far. There's originality, creativity, and a loads of excellent vocabulary all in one story. :)
Just a side note though, hopefully it could help if you were to write another... Perhaps it is best to avoid creating Mary Sues - characters which are extra-ordinary, well-liked, powerful and is loved by all the main guys in the story. It could get slightly dull for the reader at times because the main character is just too perfect, you can almost expect what's going to happen next.
... ((Although I admit I used to make such mistakes. Hehe.))
But all in all, your story is still so much more amazing than any other avatar fan fictions out there. Thanks for creating this one. You're talented, and I admire that of you!
Keep working hard :-)