Ozai
Ozai makes his first full appearance in the first episode of season 3, "The Awakening", after the Earth city of Ba Sing Se is conquered by Azula and the Fire Nation. Ozai now welcomes his son, Zuko, home after Azula states that he killed the Avatar. While in a war meeting, Zuko states that even though the Earth Kingdom is conquered that they would still not officially give up. Ozai concludes that the only way to defeat their resistance is to use the power of Sozin's Comet to increase the Fire Nation's power. When it becomes known that the resistance plans to invade the Fire Nation during the eclipse, Ozai evacuates the capital city and hides underground. There he comes face to face with his son, Zuko, who finally stands up to him saying he did not kill the Avatar and he's through trying to earn his love. Zuko states that what Ozai is doing is wrong, that the Fire Nation should live in peace and kindness with the other nations instead of spreading fear across the world. Ozai merely laughs at this. Zuko then admits he will free his Uncle Iroh and help the Avatar stop him. Ozai then provokes Zuko to kill him but Zuko refuses, saying it's the Avatar's destiny to stop him not his. When Zuko starts to walk away, Ozai distracts him by revealing what happened to his mother. When the eclipse ends, Ozai bends lightning straight at Zuko, but Zuko simply redirects it.