Cyan - Sir Sean Connery
Kefka - Kenneth Branaugh (spelling?)
Emperor Ghestal - Ian MacKellan
Setzer - Johnny Depp
Shadow - Viggo Mortensen
Ultros' voice - Quentin Tarantino
Sabin - Matt Damon if he beefed up more
Thats all I can think of right now. I liked Jim Carrey and Robin Williams as Kefka. Although they traditionally play comedy roles, seing them as a truly evil character would be an amazing sight. In fact, I think I am going to become a screenwriter now, so I can cast Jim Carrey as a really evil character.