There probably are. However, the quality can vary greatly. Some fanfictions might focus more on the action elements of 'Avatar: The Last Airbender' and use the 'Liars Kiss' aspect to add an extra layer of mystery or drama. Others could be more character - driven, exploring how the characters from both would interact. It really depends on the creativity and writing skills of the individual authors.
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.