If only they would come out with a game like Super Mario Crossover without actually being a lawsuit magnet. Yea that'd be great wouldn't it? There's just the small problem that even with a team to program, create sprites and sound, and help playtest you still need to be able to eat and pay bills during what's going to be a full time job of getting this made, tested, and put out for the masses to consume.
Wait... I know a couple games that managed to get funding without getting swallowed up by a studio that would neuter them to the point of being un-fun. Maybe the same approach would work here.
I give to you. SUPER RETRO SQUAD
Yes it's obvious who each is supposed to be an expy of. The plot is going to probably make no sense, but that's just fine since either it'll be in the documentation or maybe you'll get a one screen text wall you can skip through. It's not about the story. It's about the characters and how they'll get from A to B and murder everything between.