Zuko is a character from the cartoon Avatar: The Last Airbender.
In Avatar, there are four nations: The Air Nomads, the Water Tribes, the Earth Kingdom, and the Fire Nation. Some people are benders of their respective element(air for Air Nomads, water for Water Tribes, etc., although most people lack the ability to bend. Bending is essentially being able to manipulate whatever element it is. As Zuko is a firebender, he can control fire. He was taught by his uncle Iroh who was a master firebender, and, later in the series, was taught the nature of firebending by the creatures that invented it, the dragons. Because of this, Zuko is a master firebender, and can do things like redirect lightning, which his uncle invented.
Twin Blades Edit
Zuko has a pair of twin blades that he uses in battle sometimes. He's extremely skilled with them and made it through Fire Nation defenses using only the twin blades.