Avatar: The Last Airbender is indeed an original story. It has its own distinct style and narrative that sets it apart. The combination of elements like bending powers, diverse characters, and complex story arcs make it a one-of-a-kind creation.
Definitely not real. It's a fantasy world crafted with unique characters and magical elements that exist only in the realm of imagination and storytelling.
Common themes often include friendship and how it can transform into something more. Also, the idea of breaking traditional boundaries. In these fanfics, Aang may be facing challenges that come with being in a relationship that goes against the norm in his world. And there's often a focus on the emotional journey, like how he deals with his new - found feelings and the reactions of others.