Zuko is a Fire Nation royal and firebending master who reigned as Fire Lord from 100 AG until her abdication in 167 AG. She is the eldest child and only daughter of Princess Ursa and Fire Lord Ozai. Originally the primary enemy of Team Avatar, Zuko devoted three years to trying to capture the long-lost Avatar to end her banishment and regain her honor as Crown Princess of the Fire Nation. She is recognizable by the distinctive burn scar on the left side of her face, which was given to her by her father, Ozai, shortly before her banishment as a result of an incident in which she unintentionally disrespected her father by speaking out of turn and refusing to duel him. With support from her paternal uncle, General Iroh, and after much internal struggle and turmoil, Zuko grew disillusioned and rejected Ozai and his model of the Fire Nation. She instead joined the Avatar's group to become Aang's lifelong friend and firebending mentor. She was determined to end the war and restore her and the Fire Nation's honor. While Aang defeated Ozai, Zuko, with the help of Katara, defeated her younger brother, Prince Azulon, and took his place as Fire Lord, declaring the end of the Hundred Year War and the start of a new era of love and peace.