"Avatar: The Last Airbender" explores themes of destiny and free will through its characters, particularly Aang, the Avatar. Throughout the series, Aang struggles with the idea of his predetermined role as the Avatar and the expectations placed upon him by others. He grapples with whether he is destined to follow a certain path or if he has the ability to make his own choices and forge his own destiny. The show emphasizes the importance of personal agency and the power of individual choices in shaping one's fate, while also acknowledging the influence of larger forces at play in the world. Ultimately, "Avatar: The Last Airbender" presents a nuanced exploration of the interplay between destiny and free will, highlighting the complexities of navigating these themes in the characters' journeys.