For my money, Dean Cain looks the least like Superman. Superman should always have that all-American look to him, and Cain always looked too Hawaiian for me to buy him as the Man of Steel (Liked his Clark a lot, though!)
Dean Cain was born in Michigan and grew up in Malibu. His birth father was a half-Japanese man who served in the US Army. Otherwise, his ancestry is primarily Welsh, with some Irish and French Canadian thrown in.
I didn't even find out Dean Cain was part-Japanese until after Lois & Clark
ended, so I never noticed any ethnic distinction. I just didn't think he looked or sounded that much like Superman. Of course, the people who cast him were more interested in Clark than Superman; their original idea was never to show Superman at all but focus solely on Clark, Lois, and the Planet
. That's why Cain beat out Kevin Sorbo for the role. Sorbo definitely would've had the look for Superman if he'd dyed his hair black, but Cain made a better Clark.