"Avatar: The Last Airbender" depicts the concept of honor and duty through the characters' actions and decisions. For example, the character Zuko struggles with his sense of honor and duty throughout the series as he grapples with his loyalty to his nation and his own moral compass. Additionally, Aang's journey to master all four elements and bring balance to the world showcases his deep sense of duty as the Avatar. The show explores how different characters interpret and uphold honor and duty in various ways, ultimately emphasizing the importance of personal integrity and selflessness in fulfilling one's responsibilities.