+ The "I forgot everything and everyone I ever knew" plot is really terrible...the fact that four out of our six playable characters are all suffering from amnesia is irksome. What's even more irksome is that apparently Irvine knew the whole time and just didn't say anything because it was a plot device and well...he's just reading lines I guess.
+ I'd not have all of the playable characters be very pale/skinny white teenagers. I like a little bit of diversity. In fact, I had the most fun playing as Laguna, Kiros, and Ward.
+ I'd have a playable character that's not a human...maybe a moomba or something. A lot of my favorite playable characters in FF are not human (Mog, Nanaki, Quina).
+ The Rinoa=Ultimecia idea would be true/cannon because it makes Ultimecia a much more interesting character. If this was canon, It would also be ironic for her own "knight" (squall) to put her out of business. It would aaaalso make the idea of using Griever to fight more meaningful somehow.
+ I would eliminate the concept of a pocket station. How many people actually had that thing?
+ I'd completely revamp the relationship between Squall and Rinoa. She came on way too strong/annoying.
+ Last (for now) but not least, characters would have classes. Yep.