Aang, or Avatar Aang, is the main protagonist in the Nickelodeon cartoon "Avatar: The Last Airbender" . He is an Air Nomad born in 12 BG and the Avatar during the century-long conflict known as the Hundred Year War. His immediate predecessor was Avatar Roku and his immediate successor is 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; the powers to manipulate and shape, or bend, an element. He was also one of a select few Avatars, and one of the first in many cycles to learn the ancient art of energybending, and the first Avatar known to have actively used the technique. Aang is also capable of going into the Avatar State, a state in which he calls upon the knowledge of all his previous incarnations, and thus is much more powerful. However, should he be killed in this state, the Avatar cycle will end, and no new Avatar will be born.
Shortly before the beginning of the Hundred Year War, Aang was frozen in an iceberg for a hundred years; he later emerged, still biologically twelve years old, into a world engulfed by war. During his absence, the Fire Nation had waged war upon the other nations and managed to completely wipe out the pacifistic Air Nomads, Aang's people. It fell to Aang, the last airbender and the Avatar, to end the War by mastering the other three elements and defeating Fire Lord Ozai.
He remains a kind and goofy kid at heart, despite the overwhelming loss of his people and the heavy burdens he was forced to bear. He always stands ready to defend his friends if need be, and always tries the pacifistic approach before resorting to violence.