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I can picture SE saying no for FF and KH characters.
Primarily because FF already has a series where their characters fight, and the fact that they don't own any KH characters besides those that appeared in a FF game and TWEWY. Yes, Disney owns Sora. In fact, it's the reason why Dissidia was even made. It was originally a KH game until Disney said it didn't want it's characters in a fighting game.