This actor could make for a great Iroh.

[Leaf]

Cary-Hiroyuki Tagawa, most likely known for his recent role as Japanese Trade Minister, Nagosake Tagomi in the Amazon original program, The Man in the High Castle. In that show, he portrays a wise elder who has the ability to travel between parallel worlds. While others within the Japanese Pacific States sometimes come to him seeking his advice. I think he could look the part too if you give him a beard and longer hair.

🔗 en.wikipedia.org/wiki/Cary-Hiroyuki_Tagawa