Zuko Crown Prince of the Fire Nation

In Avatar, Zuko is the elder child of Fire Lord Ozai and Ursa. Zuko is a skilled Bender and the Crown Prince of the Fire Nation, a race of people in which some have the ability to create and manipulate fire & lightning. Before the events of the series, he is exiled from the Fire Nation by his father Fire Lord Ozai and sent to capture the Avatar in order to restore his honor and right to the throne. Zuko is accompanied and advised in his search by his uncle, Iroh.
The shows chronicles his fall and his rise.

Six years prior to the start of the series, Prince Ozai, Zuko's father, makes a bid for the throne over his elder brother Iroh, due to the latter's having recently lost both his only son and his campaign against the city of Ba Sing Se. Fire Lord Azulon, Iroh and Ozai's father, is furious that Ozai would try to cheat Iroh at such a low point in his life, and orders Ozai to kill his eldest son in order for him to realize the severity of his action. Ozai, considering Zuko a disappointment, was willing to kill Zuko to appease his father. However, in an effort to protect him, Ursa, Zuko's mother, does "terrible, treasonous and treacherous things" that result in Azulon's death, Ozai's ascension to the throne, and her own banishment.

Just a A few years after, Zuko protests a plan of attack that would have sacrificed many soldiers as bait, whereupon Ozai challenges his son to an Agni Kai for disrespecting him in his own war chamber. Unwilling to fight his father, Zuko begs forgiveness, only to be savagely burned across the left side of his face. Ozai banishes Zuko from the Fire Nation, ordering him not to return until he finds the Avatar, which was thought an impossible quest.

In Book 1 When Aang emerges from suspended animation, Zuko begins the chase immediately. They encounter each other multiple times throughout the first season, each time Zuko failing to capture Aang. During Zuko's pursuit, another Fire Nation leader named Admiral Zhao also takes up chasing the Avatar. Zhao views Zuko as a failure and a traitor, and ultimately attempts to have him murdered. Zhao himself died when he refused to accept Zuko's help when he (Zhao) was seized by an Ocean Spirit.

The second season opens with Zuko and Iroh still chasing the Avatar, only to be confronted by Azula, Zuko's younger sister. They escape and realize they have been branded traitors to the Fire Nation. Now on the run from Azula, Iroh and Zuko travel the Earth Kingdom, seemingly aimless. Eventually Zuko splits away from Iroh, feeling he could no longer learn from his uncle. However, Iroh follows Zuko out of concern, and the two reconnect after Azula injures Iroh. Zuko begins his transformation, no longer driven by hunting the Avatar, and is allowed to begin to establish an identity free of pursuit. Their travels take them to Ba Sing Se, where Zuko follows his uncle's advice and tries to make a new life for himself. Something he is forced to accept, when Zuko finds the Avatar's bison until when faced with the opportunity to kill Appa or free him zuko chooses the latter which gives hin a new outlook on life. Later, to return home, Zuko chose to side with his sister. After Aang is mortally wounded by Azula, Iroh fights off Azula, Zuko, and the Dai Li. After being betrayed by Zuko, Iroh looks on his nephew with shame. Almost immediately, Zuko begins to regret his actions.

The final season begins with Zuko and Azula's return to the Fire Nation after conquering Ba Sing Se. Both are praised as heroes through the Fire Nation for capturing Ba Sing Se and for killing the Avatar. However Zuko suspected Aang is still alive, which Azula comes to suspect as well. In order to protect herself in case the Avatar returns, she tells Ozai that Zuko killed the Avatar. Zuko soon begins to show more signs of regret for his past deeds, and is shown visiting Iroh in prison, often asking for advice. After many such visits, Zuko learns that he is a descendant on his mother's side of Roku, the previous Avatar, and therefore bears the task of restoring balance to the world. At a war meeting, he unintentionally helps Ozai invent a plan by which to burn the Earth Kingdom to ash. Catalyzed by this new shock, he decides to leave the Fire Nation and join Aang. During the eclipse he confronts his father putting himself firmly on the Avatar's side, and leaves, later to discover that Iroh has escaped from prison. Aang and company only gradually come to accept Zuko, but eventually befriend him. When Zuko's lack of resolve weakens his firebending power, he and Aang travel to discover the long-forgotten source of firebending, ultimately to learn it from their world's last two dragons. Later, Zuko helps Sokka free Suki and Sokka's father, Hakoda, from the Fire Nation's maximum security prison, the Boiling Rock. He also helped Katara attempt to find her mother's killer in order to make amends for his betrayal of her in Ba Sing Se. Inferno's fave episode (besides Sozin's Comet)

In the play: Boy in the Iceberg Zuko is faced with many dillemas such as him rejecting his uncle at Ba Sing Se and him failing against azula in the inevitable confrontation.

During the finale, Aang disappears shortly before Sozin's Comet arrives and Zuko is put in charge of finding him. When Zuko is unable to find Aang, he instead finds Iroh, who immediately forgives him. Iroh then tells Zuko that he must face Azula for the crown and that Katara must assist. At the Fire Nation capital, Azula challenges Zuko to agni kai. Zuko accepting because he feels Azula is crumbling. During the duel, Zuko clearly has the advantage due to his remaining calm and Azula's deteriorating sanity. In a desperate attempt, Azula attempts to strike Katara down with lightning. Zuko jumps in front of the lightning, managing to redirect most of the energy, but is injured. Katara then defeats Azula and heals Zuko.

After the war, Zuko is crowned as the new Fire Lord. After his coronation, he visits Ozai in prison to learn his mother's whereabouts (the answer is not shown). He is later seen with the main characters at his uncle's tea shop, which marks his last appearance in the series.