Aang

Aang was an Air Nomad born in 12 BG and the Avatar during the Hundred Year War, succeeding Avatar Roku[7] and preceding Avatar Korra. As the Avatar of his time, he was the only person capable of using all four bending arts: airbending, waterbending, earthbending, and firebending. He was also one of a select few Avatars and one of the first in many cycles[8] to learn the ancient art of energybending as well as the first Avatar known to have actively used the technique.