Aang

"No, Fire Lord Ozai. You're not wearing pants!"

- Aang

Avatar Aang is an Air nomad and was the Avatar during the hundred years war with the Fire nation. As the Avatar, Aang is the only one during his lifetime to master all of the four bending arts. As the Avatar, Aang was tasked with maintaning balance in the world, and in his lifetime this meant putting an end to the war brought upon the world by the Fire Nation. At the start of the war, the Fire Nation Nation committed a genocide of the Air Nomads, of which Aang unknowingly escaped before being caught in a storm and unconsciously using his banding to freeze himself and his flying bison Appa in ice. Aang remained frozen for one hundred years before being awakened by Katara, a waterbender and her brother, Sokka. In that time, the Fire Nation had nearly defeated the other nations and Aang and his new friends set out to save the world.

Aang, as the avatar, trained in the four elements in his travels to defeat the fire nation. As an air nomad Aang was already adpet at Airbending. Learning Waterbending from Katara and at the Northern Water tribe. Along his travels Aang met Toph, who taught him Earthbending And later learned Firebending from his former enemy Zuko.