Aang is the protagonist of Avatar: The Last Airbender, a 12-year-old boy who is the last surviving Airbender and the reincarnation of the Avatar, a being who can master all four elements (air, water, earth, fire) to maintain balance in the world. After being frozen in an iceberg for 100 years, he is discovered by Katara and Sokka and embarks on a quest to master the elements and defeat the imperialist Fire Nation, all while grappling with his pacifist nature and immense responsibility.