Zuko

'''"I used to think this scar marked me - the mark of the banished prince, cursed to chase the Avatar forever. But lately, I've realized I'm free to determine my own destiny, even if I'll never be free of my mark."

- Zuko '''

Background
Zuko was an anti-villain in Avatar The Last Airbender especially in the first season. He was banished by his father, Firelord Ozai and seeked to capture or kill Avatar Aang to redeem himself. He gradually became good and eventually joined Aang's companions. He became Firelord after he defeated his sister Azula on the day that would have marked the coronation of his sister as Firelord.

Fire Bending
Zuko was  a skilled fire bender whos abilities drastically improved over time. He eventullaly learned the original firebending from the dragons which greatly improved his bending as it better fit his personality. Along with the other firebending moves Zuko could also redirect lightning, being one of the few people to be able to do this along with Iroh and Aang.

Other Abilities
Zuko was also a skilled swordsman and used a pair of Dual Dao swords (twin broad swords) in combat when fire bending was not an option (such as when he resuced Aang from Zhao, episode: The Blue Spirit) He told Lee (in the episode: Zuko Alone) not to think of the wepons as two swords but rather of a single whole. Zuko also displayed stealth and acrobatic abilities (again, such as when he rescued Aang from Zhao.)

Trivia

 * Zuko's first act as Fire Lord was to send search parties for his mother
 * He's the only character in the show to have an episode to himself
 * He was apart of all three Agni Kais show in the series