WHERE CAN I FIND A GAME LIKE THIS

Are there any particular universes you would like in your game...
Because that would make it easier to search for.

I mean, there are probably a few crossover games on here. The one I'm thinking of off the top of my head is a mixture of Final Fantasy characters mixing up with other characters within that franchise.

Oh, wait, I think Jello and the Valley of Duh might be considered a crossover game? I know very little about it, though, so, don't take my word on it.