There are several possibilities. It might be an airbender who was born outside of the Air Nomads, perhaps from a mixed - race family. Or it could be an ancient airbender who was trapped in a spirit realm and has now returned. Another option is that it's a new airbender who has spontaneously developed the ability through some kind of unique event or connection to the spirit world.
It's a cartoon. Anime typically comes from Japan and has certain specific traits that Avatar The Last Airbender doesn't possess. This show has its own unique charm as a Western cartoon.
Avatar The Last Airbender is typically classified as a cartoon. It has distinct elements such as its animation style, story themes, and the way it's produced that set it apart from traditional anime.
Yes, there are likely fanfictions out there with this concept. The idea of a female Naruto in an Avatar: The Last Airbender - inspired setting can lead to some really interesting crossovers. Fanfiction writers often like to mix different universes to create unique stories.