In "Avatar: The Last Airbender," the characters' friendships and alliances undergo significant changes throughout the series. For example, Aang, Katara, and Sokka's bond strengthens as they travel together, facing challenges and victories as a team. Zuko's shifting loyalty from his quest to capture Aang to joining Team Avatar also showcases how alliances can evolve. Over time, characters like Toph and Zuko become integral parts of the group, forming new friendships and alliances that impact the dynamics of the team. These changes in relationships are crucial for character development and the overall narrative of the series.