Aang was a male Air Nomad born in the 12 BSC and the Avatar during the century-long conflict known as the Hundred Year War. His immediate predecessor was Avatar Roku, and his immediate successor was Korra. During his lifetime, like all Avatars, was the only capable person to waterbend, earthbend, firebend and airbend. He can also energybend.
Aang was fun-loving, somewhat naive, and adventurous with a sense of humor. He possessed a deep respect for life and freedom, refused to eat meat, and was often reluctant to fight. He craved the stimulation of new people and places. His frequent off-course detours frustrated both allies and pursuers alike. He would usually want to forget his duties as the Avatar and would long for the normality that others possess. Yet Aang had always prided himself on a complex social network of friends extending over all four nations, and war did not stand in his way. In addition, he looked forward to playing with all the exotic fauna in each place he visited. Whether it was otter penguins, hopping llamas, hog monkeys, or giant Elephant koi, no fit animal Aang saw went unridden.
Within this carefree exterior, however, Aang hid a great deal of guilt and a heavy mental burden in his duties as Avatar. Very much the , he wished he had been there to help his people a century ago. This initially caused him to conceal his true identity from friends, and he still had a tendency to slack off in his studies of the bending arts, even though he naturally excelled at it. He also tended to become very distressed when he saw destruction caused by the Hundred Year War, believing that as the Avatar, it was his job to prevent such events from happening. Eventually, Aang decided to stop dwelling on the past; however, on several occasions his desire to end the War caused him to take desperate action such as attempting to induce the Avatar State or facing Fire Lord Ozai before he had fully mastered the elements.