Aang
After the 100 years he was in the iceberg with his bison, the story starts when Katara and her brother Sokka free Aang and Appa in the first episode. In the next episode, they all started the trip to the Northern Water Tribe, with hope to find a waterbending master to teach Aang and Katara how to control the water. During their journey they are chased by Zuko, the banished prince of the Fire Nation, who must capture the Avatar to return his honor. In one episode, Aang meets his previous incarnation, Avatar Roku (born on Fire Nation), who said him that he must learn all four bending arts and win Fire Lord Ozai before the end of summer. When the team, named team "Avatar", arrived in the Northern Water Tribe, a Waterbender named Master Pakku teaches Aang (and later Katara) waterbending. Later, in the second season, Aang meets Toph Bei Fong, a blind earthbending, who becomes his earthbending teacher. Later, Aang and his friends learn about the solar eclipse, which will occur before the end of the summer, and will block the Firebenders powerless. During the season finale, a guru tried to teach Aang how to open up his seven chakras in order to control the Avatar State. When Aang has a vision of Katara being in danger, he leaves the Air Temple where he is being taught before the seventh chakra is opened, locking it. He then battles in the underground caverns of Ba Sing Se. He is killed when Azula strikes him with lightning, but is brought back to life thanks to Katara's special water that has healing abilities, and also her healing abilities.