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As for which FF I think has the best characters, IV has a very strong main character in Cecil Harvey, but the supporting cast has a few weak points, notably the twins, Palom and Porom, who seem to serve little function for the overall plot. VI, on the other hand, is unique in that it has a de-centralized cast, where you never are told outright who the main character is. I'm of the opinion that the game begins and ends with Terra Branford, but it isn't as if the game is focused entirely on her story.
So, long story short, I like the bait-and-switch that VI pulls on you, but Cecil Harvey is my favorite FF character.
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