Sozin

History
Sozin was the Fire Lord who started the War with the other nations. He was the Father of Fire Lord Azulon, grandfather of Fire Lord Ozai and General Iroh, and great-grandfather of Prince Lu Ten, Prince Zuko, and Princess Azula.



In his youth, Sozin and Avatar Roku were best friends, and even shared the same birthday, which they celebrated together. At one such party, Roku was told by the Fire Sages he is the Avatar, and the two are forced to separate as Roku goes to learn mastery of the three other elements. Before leaving, Sozin gives him a gift of the headpiece worn by the Crown Prince.

Twelve years later, Roku returns to the Fire Nation, and Sozin has become Fire Lord. At Roku's wedding, Sozin takes the position of his best man. At the wedding, Sozin comments that the Fire Nation is going through a period of great prosperity, and tells Roku that together, the two of them could spread it to the world by expanding the empire. Roku is greatly disturbed by this, telling Sozin that the Four Nations are meant to be kept separate and that he should not think of this again. Years later, however, Roku discovers that Sozin has set up colonies in the Earth Kingdom, and comes to rebuke him, leading Sozin to attack him. The two engage in a battle, with Roku finally destroying most of the palace and defeating Sozin, sparing his life from their past friendship, but warning him never to move forward with his plans again.

Twenty-five years later, Roku's home island is consumed in a volcanic eruption so massive that Sozin can see and feel it from a hundred miles away, and flies in on his dragon to assist his old friend. The two use their Bending to try to contain the lava flow, but are hindered by poisonous gases, which eventually overwhelm Roku, leaving him lying on the ground and begging for his old friend's help. Sozin suddenly realizes, however, that Roku's death would allow him to fulfill his plans, and leaves his old friend to die along with his dragon Fang.

Twelve years after Roku had died, Sozin used the power of a comet to enhance the power of his Firebender army and launched a genocide on the Air Nomads in an attempt to kill Aang, the new Avatar, and halt the Avatar cycle. However, Sozin failed, as Aang had run away from the Air Nomads some time before. Sozin spent the rest of his life searching, so that he can find and destroy "the Last Airbender."