Zuko

Fire Lord Zuko is a skilled and powerful Firebender, born as a prince in the Fire Nation royal family. His story often paralleled that of the Avatar, Aang. Initially the main antagonist, Zuko's life revolved around trying to capture the long-lost Avatar to end his banishment and to regain his honor as Crown Prince of the Fire Nation.

Zuko is easily recognized by the characteristic burn scar on the left side of his face given to him by his father, Fire Lord Ozai, shortly before his banishment because of an incident in which he embarrassed his father by speaking his mind. On his journey to capture the Avatar, he is assisted by his uncle Iroh in Firebending training.

With support from Iroh and after much internal struggle and turmoil, Zuko rejects the Fire Nation and joins the Avatar's group to become Aang's friend and Firebending teacher. While Aang defeats Ozai, Zuko, with the help of Katara, defeats his prodigious younger sister Princess Azula and takes his place as Fire Lord, and declares the end of the war and the start of an era of love and peace.