Aang is The Last Airbender.
Aang is the series' reluctant hero. Aang to defeat enemies with his wits and be a Trickster.
Aang as the last surviving Airbender and a monk of the Air Nomads, the people able to manipulate the air. He is a supercentenarian at the age of 112; but biological age twelve. He is the current incarnation of the "Avatar", the spirit of the planet in human form. As such, Aang has the ability to control the four classical elements and is tasked with keeping the Four Nations at peace. Aang's journeys to complete this task, during a war instigated by the Fire Nation.
Elders of the Air Temple hold a private meeting with Aang to reveal his identity as the Avatar. Monk Gyatso, Aang's mentor and father-figure, insists that Aang be raised as an ordinary child; whereupon the other elders attempt to separate the two, prompting Aang to flee their monastery. During this flight, Aang and his bison Appa become caught by a storm, and later encased in an air-pocket among iceberg.
After 100 years therein, Katara and her brother Sokka free Aang and Appa; andthe four embark to find a Waterbending master to teach Aang and Katara. Throughout their journey they are pursued by Zuko, the banished prince of the Fire Nation. Aang meets his previous incarnation, Avatar Roku, who informs him that he must master all four bending arts and defeat Fire Lord Ozai before the end of summer.Among the Northern Water Tribe, Waterbending Master Pakku teaches Aang, and later Katara. Aang learns earthbending from Toph Bei Fong, a blind earthbending prodigy. A guru attempts to teach Aang to open his seven chakras in order to control the defensive 'Avatar State'; but when Aang perceives Katara in danger, he leaves before the seventh chakra is opened, and thus loses his progress until the seventh is opened by another figure. At the end of the finale, Aang opens the seventh chakra, only to be shot down by Azula with lightning, and is therefore killed in the Avatar State. For an unknown period of time, the reincarnation cycle broke due to the mortal wounding of the Avatar Spirit, and the Avatar fell from the plane of existence, Katara brought both the Avatar Spirit, and its current host, Avatar Aang, back to life with water from the Spirit Oasis at the North Pole.
Aang and his remaining allies attack the Fire Nation's capital; but are thwarted by Princess Azula. Zuko has a change of heart and offers to teach Aang firebending. In "The Firebending Masters" Aang and Zuko learn firebending with the help of their world's last two dragons.
Aang learns a new rare bending called Energybending, or manipulating the energy in another person ,by an immense 'lion-turtle'. This particular bending is the riskiest because "to bend another's energy, your own spirit must be unbendable, or you will be corrupted and destroyed". Enabled by this encounter, Aang removes Ozai's ability to manipulate fire, and thus renders him harmless. Later, in the Fire Nation capital, Aang is seen beside Zuko while the latter is appointed Fire Lord.
The Legend of Korra, Korra is the next Avatar following Aang. It has been revealed that Aang and Katara were married, and had three children including Kya, Bumi,and Tenzin, an Airbending Master who resides in Republic City, a location which harbors Benders from all over the four nations; and that Aang has died at the age of 66. Aang can be seen as an adult.