I would want to see a spin-off starring Jenova. The gameplay would be exactly like the gummi ship sequences in KH. You're flying around on whatever planet she wasted and your enemies are the defenders of whatever planet she's looking to waste next. Then at the end you've got to fight wave after wave of the defenders until you build up a planet destroying beam and then BLAMO you're onto the next level to do it all again.

I would love to see more about Red XIII. He's one of my favorite characters.