I have a few that would be interesting, but it's not all games, some of them are shows.
- I'd like to see a Project X Zone 3 in a more traditional fighting game style, honestly. Capcom vs SNK vs Sega vs Nintendo in a Street Fighter or even Blazblue style. That'd be great.
- Mobile games fighting game would be fun. Cookie Clicker Granny against an Angry Bird would be hilarious.
- Kingdom Hearts the fighting game. Would probably never happen (Disney and all) but would be a great idea.
- A Cross Tag Battle 2 would be fun. I don't know if that would happen, though.
- An MUGEN-style open source MK-a-like with 3D graphics would be fun. I would honestly put in some of the MUGEN originals into the game (some with way better graphics and imaginative fatalities) if that existed.
- Toei 'Transforming Heroes' franchises. Digimon vs Kamen Rider vs Super Sentai vs Pretty Cure. That'd be fun.
- 70s Saturday Morning fighting game. Hanna-Barbera vs Ruby-Spears vs Filmation? Would love to see Fangface in a fighting game... or beat the crap out of Scrappy Doo with Socks from Mission: Magic!. xD
- Archie fighting game would be fun, since Archie kinda ruined their brand with Riverdale. Plus being able to beat the crap out of Randy the Otaku or Reggie Mantle would be fun. My main would probably be Jughead Jones or January from Time Police with that one.
- European comics fighting game would be fun. I think Gaston Lagaffe has potential for some fun moves, plus I can picture a Tintin character that has Snowy and Haddock as strikers.