Avatar: The Last Airbender
While Katara, Sokka, and Aang travel to the Northern Water Tribe, they are constantly chased by Prince Zuko. Zuko is the son of the current Fire Lord, Ozai, but Ozai banished him from the Fire Nation three years before the story starts. Zuko can only return to the Fire Nation and get back his honor if he captures the Avatar. He travels with his uncle Iroh, nicknamed "Dragon of the West", a legendary Fire Nation general and the older brother of Ozai. Zuko and another Fire Nation military officer, Admiral Zhao, compete to capture the Avatar. At the end of the season, Admiral Zhao leads the Fire Nation navy in attacking the Northern Water Tribe. During the attack, Zhao also kills the Moon Spirit. But Aang and his friends help fight back against this attack, and Yue, the princess of the Northern Water Tribe, sacrifices herself (in other words, she decides to die) so she can become the new Moon Spirit. In the end, Aang and his friends win the battle.