Iroh plays a crucial role as a mentor and father figure to Zuko and others in "Avatar: The Last Airbender." He provides guidance, wisdom, and support to Zuko throughout his journey, helping him navigate his inner turmoil and find his true path. Iroh's gentle yet firm approach influences Zuko's growth and development, shaping him into a better person. Additionally, Iroh also acts as a mentor to other characters, offering advice and lessons that help them mature and overcome challenges. Overall, Iroh's presence as a mentor and father figure is instrumental in the characters' development and the overall narrative of the series.