Ozai
Ozai (also known as Fire Lord Ozai or the Phoenix King) is a fictional character and the main antagonist in Nickelodeon's animated series Avatar: The Last Airbender.  Though once shown behind the scenes than recurringly, he is nevertheless an important character in the series as he is the father of Azula and Zuko.  He is also the younger brother of Iroh and is the rival of the main protagonist of the series, Avatar Aang who must stop Ozai to bring balance to the world. He is also Fire Lord Sozin's grandson. He is also member of the 5th Council. He is voiced by Mark Hamill and will be played by Daniel Dae Kim in the live-action remake.