Main characters of "Avatar: The Last Airbender" include Aang, Katara, Sokka, Toph Beifong and Prince Zuko. Other characters include Iroh, Momo and Azula. None of these characters appear in "The Legend of Korra," the sequel series.
Aang's animal guide and spirit companion is Appa, a flying bison. Aang is rescued from a century of suspended animation by Katara and Sokka and learns Waterbending at the North Pole. Aang's legacy goes on to influence "The Legend of Korra" storyline.
Sokka is a 15-year-old warrior of the Southern Water Tribe. Sokka does not have any bending powers, so he relies on a metallic boomerang, a blunt metal club, a machete and a black jian created from the metals of a meteorite.
Katara is Sokka's younger sister who masters the art of waterbending and acts as den mother to the other characters. Her character becomes enamoured easily, and is often angered by treachery or dishonesty.
Toph is a mentor-type character who helps Aang master Earthbending after leaving her home. She is commonly depicted as the choleric tomboy of the group. Via this heightened sense, she can identify people's locations as well as their size.
Zuko is a firebender and is proficient in the use of double broadswords. He is tempted by his sister Azula's offer of honor's restoration; he betrays his uncle to assist Azula's fight against the Avatar.