The obvious comparison to make with Final Fantasy XII: Revenant Wings is the Tactics series. Both games take the idea behind Final Fantasy and put it into a different realm of gameplay. This may be true, but the game that is most like Revenant Wings is another direct series sequel, Final Fantasy X-2. These are basically the same game, albeit with a different plot, characters and gameplay, on a different type of console. This is the handheld equivalent of X-2, following two characters from the previous game on an airship that leads them to another adventure.
