Kingdom Hearts: Hoodlum Havoc

Kingdom Hearts: Hoodlum Havoc is a crossover video game based on the 2003 video game sequel, '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! and save Globox as well!