The graphic novels like 'The Promise' are really important as they continue the story in a new format. They allow fans to see more of their favorite characters' growth and development. 'The Search' in particular gives a deep look into Zuko's family history, something that was only hinted at in the show. 'The Rift' also adds a lot to the lore, especially regarding the relationship between different bending groups.
Yes, it does. The novels offer additional perspectives and adventures within the Avatar universe. They can be a great way for fans to delve deeper into the lore. For example, they might explore the backstories of some characters more thoroughly or introduce new storylines that couldn't be covered in the show due to time constraints.
They can be quite good. The art is often impressive, and the storylines stay true to the spirit of the show. However, it depends on your personal preferences for the format and style.
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.