Azula: the New Avatar

Azula dropped to the floor in a crouch, listening for footsteps, the rustle of clothing, the creak of a bow being drawn.

Nothing.

She took two steps forward, and then-THRUM. The deep thrumming sound of a longbow being fired came from behind her, and she frantically twisted around. Time seemed to slow down. She was facing her attacker, the arrow was on its way, and she had no chance of getting out of the way in time. She brought her hands up instinctively as if to catch it, cursing her carelessness. The arrow froze. She blinked, looked at her hands.

Was that... Airbending?

Crown Princess Azula, heir to the Fire Nation throne after Zuko's banishment, never makes mistakes. When an assassination attempt gets too close for her to stop on her own, though, she's forced into a new reality in which her entire identity is a mistake, and the only one she can trust is her weak, all-too-compassionate brother. Azula is the Avatar.

I'm not going to lie, I took this idea straight from a screenshot of a post I saw on instagram. I'm pretty sure the original post was ineffectualdemon on tumblr, but I'm not sure. AU where the cycle continued, and Azula became the Avatar.