It seems to be a bit of a mix between swedish/dutch/netherlands, english, with a slight america tone to it on occasions (which to me seems to become more prominent as the game goes on). It is definately very odd, especially since none of the other Viera seem to talk like this. Given Fran is pretty darn old, it's fair to say that the accent has probably been picked up elsewhere, perhaps some far-away land away from the main area where the game takes place.