All 61 episodes of Avatar were filled with Action and Adventure. The friendship between Aang Katara, Sokka and Toph is an important element of this show as it shows the diversity in cultures imprinted in the world of the avatar. It also introduces a romantic twist to multiple episodes and takes you on a personal journey where you become biased to a specific character. As I have said, friendship is an important story line to Avatar. Without the help of Katara, Sokka and Toph, he would of never defeated Fire Lord Ozai and wouldn't even be broken out of the iceberg. Aang discovers his sense of identity through the support of these relationships he makes and is even able to convince his enemies to become his friends.