Kingdom Hearts: Hoodlum Havoc

Kingdom Hearts: Hoodlum Havoc is a crossover video game based on the 2003 video game, 'Rayman 3: Hoodlum Havoc. 'it would have to be made by Square-Enix (for the Final Fantasy characters) and Ubisoft (for the Rayman characters)

Plot
Sarah West is in a video game called "Rayman 3: Hoodlum Havoc". where she and Rayman have to defeat Andre, the Hoodlums like Hoodbooms, Hoodstormers, Grim Keeper, Grim, Hoodblaster, Hoodoo, and Xowar, Begoniax, Razoff, Celoche, and Reflux!