The finale focuses on series protagonist Aang's non-violent personality and his reluctance to kill Fire Lord Ozai. The finale also follows the exploits of many of Aang's friends and allies, including Sokka, Toph and Suki's struggle to destroy a Fire Nation airship armada, Zuko and Katara's battle against Zuko's sister Azula, and Iroh, King Bumi, and the Order of the White Lotus' attempt to reconquer .