The easiest would be FF1, purely because you couldn't really fail at creating the characters since they don't have any personality to begin with.

I'm not sure why there aren't any real blockbuster FF-styled movies with 'jobs' allocated to main characters. I mean, you could have a white mage, black mage, all that sort of thing. There are books in a similar vein - the Raven books by James Barclay are, I find, incredible works that really capture a lot of the FF spirit when it comes to the characters.