You're still kind of ignoring the obvious point that almost everyone has said: Japan has a different culture. I tried to give a little more specific insight into why their culture is different, and I could give more, yet you don't really seem that interested in it.
Keep in mind this is the same guy who argued bullheadedly that despite the fact the he acknowledged that Sora, Riku, and Kairi are not English names that they should still have American English surnames. Cultural distinction doesn't really seem to be in his vocabulary.
Forget about the surnames. I just want to know why we like more "big, bad, and edgy" characters moreso than the Japanese. I know that that there are differences, but I want to know WHY.