Easygoing, friendly and dryly good-humored, Iroh treats his self-imposed exile like an extended vacation. in his old age, he shows more interest in relaxation and amusement than in his nephew's pursuit of the Avatar. Despite his age, Iroh is seen flirting with various women throughout the series and has been addressed as "handsome" on multiple occasions. Nevertheless, he is a seasoned and wily strategist,a powerful Firebending master and a loving and sagely mentor to his nephew. In general, Iroh's inherent nature and the course of his life have brought him to a philosophy that embraces peacefulness, harmony, and mutual understanding rather than conflict. However, when he is personally threatened or observes injustice and violence against the innocent, he is capable of becoming a fierce and intimidating adversary.

Note- You have to sound similar and act exactly like him for this role. Recommend watching some videos on Iroh to get a grasp of the character