Avatar Aang

Aang was an Air Nomad and successor to Avatar Roku. A little before the 100 Year War, Aang ran away due to the mounting pressure of his duties as Avatar. Aang was frozen in an iceberg for 100 years until he was discovered by Katara and Sokka. Aang discovered what had happened to the nations after he left and relized it was his duty to restore order to the nations.