Even prior to learning he was the Avatar, Aang distinguished himself by becoming one of the youngest Airbending Masters in history by inventing a new technique.As a result of Fire Lord Sozin's increasingly hostile attitude towards the other nations, the senior monks decided to reveal Aang's nature as the Avatar four years before the traditional age (Avatars are usually told of their status once they turn 16) and relocate him to one of the other Air Temples.At 12 years old, Aang is the series' reluctant hero, spending a century in suspended animation in an iceberg before joining new friends Katara and Sokka on a quest to master the elements and save their world from the imperialist Fire Nation.Aang's character has appeared in other media, such as trading cards, Upon death, Avatar Roku was reincarnated and Aang was born, and later raised by Monk Gyatso, a senior monk at the Southern Air Temple and friend of the late Avatar Roku.Aang grows upset and angry and confronts the Sandbenders, learning that Appa has been sold.After stopping a Fire Nation drill threatening the safety of Ba Sing Se, they look for Appa only to find themselves dealing with the Dai Li before exposing their leader's deception.The group reunites with Jet helping them find Appa at Dai Li headquarters.They expose the Hundred Year War to the Earth King, who promises to help them invade the Fire Nation.
In the third and final season, Aang is unable to use the Avatar State.
Aang was survived by his wife, Katara, and his three children, but he did not live to see his grandchildren, all of whom would become powerful Airbenders.
Prior to his death, Aang tasked the Order of the White Lotus with finding and guiding the new Avatar after him.
He is an incarnation of the "Avatar", the spirit of light and peace manifested in human form.
As the Avatar, Aang controls all four elements (water, earth, fire, and air) and is tasked with keeping the Four Nations at peace.
In the sequel series' first season, Avatar Aang's spirit occasionally serves as the spiritual advisor to seventeen-year-old Korra (much like the previous Avatar incarnation, Roku, did for Aang).