Bad Finale AU - TNT wins the finale battle and some dictator shit happens.

Reverse Finale AU - Highlighty wins instead of Cuboid.

Extra Fighter Finale AU - TNT and Cuboid will have another problem to get through if any one of them wants the island.

Reverse Personality AU - Everyone's personality gets reversed.

Murder AU - Teenagers killing each other. Probably won't end very well for anybody but him.

Happy AU - The contest would be more peaceful instead of constant death and beating up characters from different universes. (bit boring tho)

Romance AU - Everyone gets a fair chance of getting a boyfriend/girlfriend.

Dating AU - Basically the same as above but your self insert is going to date a contestant. (lets see who you simp for)

NSFW AU - All of the contestants have an orgy. Consenual or not.

alright i've ran out of ideas to inspire you