Nomura designed the characters in FFVII, FFVIII, FFX and FFX-2, hence why they were included in KH and KH2 (Nomura's the director for both KH games). The FFIX characters were not designed by Nomura, so he was less inclined to include any of them. However, due to Vivi's popularity he decided to back down and put him in the game.
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