Kefka - Mark Hamil... yes, Luke Skywalker.
Gesthal - Ian McKellen. Really any creepy old dude, actually.
Edgar - Ewan McGregor.
General Leo - I'd say Mr. Muscles from Brussels.
Strago - ... Sean Connery. *thinks* Yeah, they could use CG to make him short and whatnot.


More later, as I think of them...

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"Life... Dreams... Hope...
Where did they come from?
Where are they headed?
These things... I am going to destroy!"
-Kefka Pallazzo *huggles Keffy-sama*