Why would you all want real people to play the parts? That's really odd, I think it would be better with Japanese actors and two It would probably be good as a CG movie like Final Fantasy VII Advent Children.
1- Japanese actors aren't real people?
2- FF8 and its characters were supposed to be explicitly more western, hence basing Squall on River Pheonix.
3- If we're doing CG, Robin Williams as 3/4 the cast.