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.
First, create a detailed and interesting fem OC. Think about her background, like where she's from in the Avatar world, her family, and what kind of bending ability she might have or if she's a non - bender. Then, decide on the plot. Maybe she teams up with Aang and his friends on a new quest, or she has her own mission that intersects with the main story. For example, she could be on a journey to find a long - lost bending technique.