Very believable as a Eurasian in Kung Fu.
https://en.wikipedia.org/wiki/David_Carradine#/media/File:David_Carradine_as_Caine_from_Kung_Fu_-_c._1972%E2%80%931975.jpg
I was actually very surprised when I found out he was almost 100% Irish and had no Chinese blood whatsoever. His looks, his demeanor, were very convincing.