Seemings as this is obviously Sony's answer to Smash Bros. they will probably be forced to use as many characters from their properties as possible (though I'm confused as to how some might work, though I don't know how the game will play yet so I should probably hold judgement). They will also likely try to get 3rd party characters as well like Snake and Cloud, but I personally would like to see some different FF characters and maybe try and get som tales characters, but that won't happen. Nothing else is coming to mind as to what I would like to see, but I'm sure there's some others.
Food for thought: Shove an apple in your brain







