The problem with your idea lies in his proposed move-set. Random moves are a terrible idea, mostly due to competitive play. If people want randomness, they'll turn on items.
Random moves are terrible in your opinion, and items are cool.
Aside from the obvious competitive deficiency inherent in the character design, his moves themselves are overpowered, especially his neutral and down b moves. No final smashes have a guaranteed kill chance, even a small chance at one could greatly alter certain aspects of the game, best left unchanged. Aside from that, no move should be able to heal, without some type of exterior condition being met, IE: A Smash Ball, an attack being absorbed, or the creating of an item usable by another player.
Once again, this is all your opinion.
Also, special moves are supposed to be special. Take side B for example. It's a basic smash attack type move, and has no place among his "Special" moves.
Quit with the opinions already! >B doesn't have to do anything particular. Look at Mewtwo's.
If the entire Mog supporting community can't think of a decent move-set for the character they most support, what makes you think the creators will be able to do better for a relatively obscure character.
STFU and get out, you are just pissing people off now.
As a side note, a final fantasy crossover seems less likely than many of the other choices , due to the fact that Sony has largely taken over the franchise. Why support something that doesn't help the company as a whole? With no long term benefits apparent for Nintendo , it seems unlikely that FF will see a representative at all, although anything is possible.
Only the last thing you said made a valid argument. Anything is possible.