So, this plot is for my Airbender, Layla.
She lives in the Western Air Temple, and she doesn't have much company. One day, she found three flowers growing near the edge of her balcony, and she managed to pick them. She send them blowing in the wind, to corners of the world, meaning one to each nation, excepting Air.
Plot: Three men (human/bender), will each find a flower, and wonder where it came from. Each of them will find himself drawn to finding out where the flower came from, from the mystic vibes Layla gave to these flowers through her. They will come to the conclusion that it came from the Western Air Temple, and go on a quest to find Layla. Two will fail reaching the temple, while one will find her and together, they will leave the temple, helping Layla break free.
After that, who knows?
EARTH:
FIRE:
WATER: