"Avatar: The Last Airbender" portrays leadership and responsibility in various ways throughout the series. The main character, Aang, is tasked with the responsibility of saving the world and restoring balance as the Avatar. His journey is filled with challenges that require him to make difficult decisions and lead his friends and allies in the fight against the Fire Nation. Other characters, such as Zuko and Katara, also demonstrate growth in their leadership abilities and sense of responsibility as they navigate.