Elements (Avatar: The Last Airbender) (Aang LS)

Katara:

Water. Earth. Fire. Air. My grandmother used to tell me stories about the old days, a time of peace when the Avatar kept balance between the Water Tribes, Earth Kingdom, Fire Nation, and Air Nomads, which included the Elemental Benders as well. But that all changed when the Fire Nation attacked. Only the Avatar mastered all four elements. Only he could stop the ruthless firebenders along with his guide, who would be an Elemental Bender. But when the world needed him most, he vanished and the Elemental Benders were wiped out. Or so I thought.

A hundred years have passed and the Fire Nation is nearing victory in the War.

Two years ago, my father and the men of my tribe journeyed to the Earth Kingdom to help fight against the Fire Nation, leaving me and my brother to look after our tribe along with our adoptive sister, who hasn't woken up since we found her seven years ago. Some people believe that the Avatar was never reborn into the Air Nomads, and that the cycle is broken. But I haven't lost hope. I still believe that somehow, the Avatar will return to save the world, and his guide will join him.