Actually, most people definitely don't know this, but all of the Final Fantasy games that allow you to have four or more party members in battle at once* have a multiplayer option. Basically, once you're in the game, go to the menu, go to "config" or "system" options, and look for controller options. You can set however many party members you want to be controlled by the second player instead of the first player in combat. It's kind of like the Tales games, you could play the whole game without realizing it's there. But it's a great option.
This is why whenever I hear that a new FF is only going to have 3 people in battle at once, part of me dies deep down, on the inside. Of course, I still play them and end up loving them.
* I guess FF XII broke this tradition, actually, if you count the NPCs as a fourth party member.
