I...have to respectfully disagree - at least, as far as Roddenbury purposefully making Sulu a mixed asian. I wouldn't be at all surprised if he'd just thrown out two asian names and left it at that, because well...It was the 60's. People might have started getting a little more social conscious in the US [thanks the the civil rights movement], but we were still miles away from really being PC.

I'll give you that it's possible but just...with the social atmosphere at the time, I don't think it was really likely.