In the movie Fight Club, is there a plot-related reason that Raymond K. Hessel is portrayed by Joon Kim, a South Korean national with a very noticeable Asian accent? The surname Hessel seems to be British in origin, and does not match the character in the movie.
I don't think there's a plot-related reason (and I don't know if the book indicates the race of the character), but a Korean-American named "Raymond Hessel" isn't completely unbelievable.
In the US, there's a certain set of personal names which, while of European origin, are disproportionally found in people of Asian descent -- an American named "Eugene" born in the 1970s-1980s, for example, is more likely a child of Asian immigrants than not. "Raymond" is one of these names. (These names were popular for boys in America a generation or two earlier, who wound up as young men in Japan, Korea and Vietnam between 1945 and 1975.)
"Hessel" is a little more unusual, but either adoption or the character taking his stepfather's name could explain it.
Isn't the most obvious reason everything happening is from Tyler's POV? Since he's a figment of the narrator's imagination, who's suffering from insomnia, Hessel may have existed/not existed/or been Asian at all.