Avatar Katara

Earth
Fire.
Air.
Water.
My great-grandmother tells me stories about the old days, a time of peace, when the Avatar kept balance between the Earth Kingdom, Fire Nation, Air Nomads, and Water Tribes. Then, everything changed when the Fire Nation attacked. Only the Avatar mastered all four elements. Only he could stop the ruthless firebenders.
Fourteen years ago, the Avatar was killed, and the Fire Nation is nearing victory in the war. Some say that the Avatar was never reborn into one of the Water Tribes and that the cycle is broken, but I haven't lost hope. I know that soon, the Avatar will awaken and save the world.

Aang x OC
Zutara (Sorry, Kataang shippers, but I'm not shipping Katara with herself)
Sukka
On Ji X OC