FF I - character that can switch it's jobs
FF II - Maria
FF III - Ninja/Sage
FF IV - Edge, plus Rubicante as his counter part
FF V - don't really care
FF VI - Locke
FF VII - Vincent
FF VIII - Quistis, Dissidia needs a hot girl with glasses, leather outfit and a whip
FF IX - Quina, Blue Mages are so underrated
FF X - Auron
FF XII - Basch, since Gabranth's already there, perhaps even Balthier and Cid