Avatar Lexa (ATLA/The100 Crossover)

In the deep south, where the winds are harsh and the earth comes to a halt, sits a small air island apart of the Air Nation that has been secluded from the rest of world for over a century. In it, lives Lexa, an air bending prodigy who is rumoured to be the next avatar amongst the other nations through the prophecy of the great one. Although her air bending is great, the other elements of water, earth, and fire had all just been a myth to her and her people before her ascension. Nevertheless, she embarks on a journey in hopes of restoring balance to the world but she will quickly learn that mastering the elements may not be most difficult task of her life, when she meets Clarke of the Northern Water Tribe. Cultures, love, and most importantly-elements-clash when the two girls fall for each other. Lexa may be the avatar, but even she is not abstained from love.

Or

The story in which Lexa is Aang from TLA, and Clarke is Katara, although the story line is different. Lexa is an air bender, Clarke is a water bender, Bellamy and Octavia are fire benders, and Raven is an earth bender. Mostly about Lexa dealing with her upbringing of isolation, her new position as the avatar, and dealing with her feelings for Clarke.

I'm thinking about making this a short story, maybe one with twenty-five chapters. The summary is a little bad but I'll try to edit it in the future, I promise my writing is not too bad and I try to stay accurate with my portrayal of the characters personalities, hopefully you enjoy! First couple chapters are just about Lexa.