Zuko was the banished fire prince, And he had joined the Avatar team since Zuko had lost faith in the Fire Nation and feels guilty for his crimes, So he joined Aang, Sokka, Katara, Toph and Suki. The gaang.

You were a water bender of the Southern-water Nation, and the child of Tonraq, the Southern water Tribe chief. Zuko and the Avatar team had snuck into the city to steal an important scroll that Aang needed. They all spread out to find the scroll, but Zuko found something more interesting… you.