I would replace Selphie (FFVIII) with Celes (FFIII) because she would bring more personality to the story. Selphie is more of a 3rd leg in FFVIII and presence seems to be wasted, apart from her limit which i think is called something like Ultimate End. Celes on the other hand is one of the more crucial parts of the story-line and of she was in FFVIII she could have easily left a bigger impact.
Sphere Grid is my most innovative feature, it intertwines, very complex or then again very simple, the chance to customize your character to a certain degree, or to have them develop the same (at different points in the game). What Other FF does this? (maybe FFXII, but i have not had a chance to play, damned Europe...) At this point in time, none. :)
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