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.
One common trope could be the white man being an outsider who has to adapt to the unique cultures in the Avatar world. For example, he might struggle to understand the bending arts at first but then gradually master them through perseverance.