A 12-year-old hero who likes to stir up trouble. Raised by Airbender monks in a temple hidden in the mountains, Aang is the last Airbender and the only known survivor of the Air Nomads. It's Aang's destiny as the Avatar to master all four elements.
Katara is a 14-year-old girl with a big heart who's determined to save the world - or at least never stop trying. Katara wants to live up to her potential and become a Waterbender in order to save her tribe, but she's still learning to control her powers.
Daughter to Fire Lord Ozai, Azula is Zuko's 14-year-old younger sister. Azula's a lot like the typical "little Miss Perfect" younger sister, only she's also a deadly Firebender. Azula has always been the favorite of the Fire Lord.
He is the brother of the Fire Lord and Uncle to Prince Zuko. He is like an old man in retirement, who would much rather soak in the hot springs or shop in an antique store than chase the Avatar.
Katara's brother Sokka is a typical teenager who believes his way is the only way. While he shows the strength and determination of a warrior, Sokka lacks the experience to use them effectively. Sokka doesn't let his lack of bending abilities bother him.
In the beginning, Zuko is an incredibly focused, teenage Firebender who bullies and intimidates everyone around him. He is obsessed by only one desire: to capture the Avatar. Zuko's greatest weaknesses are his arrogance and impatience.
Toph is a tiny, 12-year-old girl who is the daughter of one of the richest families in the Earth Kingdom the Beifong family. She has been sheltered her whole life living within the walls of the estates, never allowed to leave.