Zuko

He was the main enemy of Team Avatar; Zuko's life revolved around trying to capture the long-lost Avatar to end his exile and regain his honor as the Crown Prince of the Fire Nation.

Zuko is easily recognized by the distinctive scar on the left side of his face, which he received at the age of thirteen in an Agni Kai against his father, Fire Lord Ozai, shortly before his banishment. The fight was the result of an incident in which he inadvertently disrespected his father by speaking out of turn and refusing to fight him.

He is of average height and very handsome. He has black hair and golden eyes, like most members of the royal family. At the age of thirteen, he was challenged by Ozai, his father, who left a scar on the left side of his face that covers his entire left eye, cheek, and ear. He looks very similar to Azula, his younger sister, but the difference is that Zuko has a kind face.

Zuko has proven to be more of a complex individual than a true villain. At the beginning of the series, there's no indication that he'll ever become an anti-villain, but over time he evolves into a hero in his own right.

Zuko's big heart was, for most of the series, overshadowed by his desire to return to the Fire Nation. He desperately wanted to reclaim his right as heir to the Fire Nation throne, but above all, he wanted to regain his father's love, recognition, and respect. Zuko believed (or forced himself to believe) that by capturing the Avatar, his dreams would come true, making Aang his greatest enemy. Zuko believed that a person becomes strong by striving and fighting for what they want.