In an interview with game informer a couple for years ago, Mortal Kombat co-creator Ed Boon says he would love to make a fighting game with marvel characters. This started rumors that Nether Realm studios is making a Marvel, Marvel vs DC, or Marvel vs Mortal Kombat fighting game. I don’t think none of these will happen because Warner Bros owns both Mortal Kombat and DC. While Disney owns Marvel. Also why Warner Bros would allow Nether Realm would make a game based on characters from their arch rivals. Also their would be a lot of legal loopholes to jump threw.
If somehow If a Marvel vs DC fighting does see the light of day, this is my dream roster. These are my rules, it starts with a 26 man roster with 13 characters from each side, 2 pre orders characters one from each side, and 2 DLC packs with 4 characters each. 2 from each side. The characters that I picked are the ones I like and the ones that both Marvel and DC will force into the game. Each character have 2 endings each. Which one you will get depends on if you defeat Thanos or Darkseid in the final fight.
Marvel
Hawkeye, Hulk, Black Widow, Captain Marvel, Iron Man, Captain America, Thor, Doctor Strange, Black Panther, Gambit, Spider Man, Wolverine, Thanos
DC
Super Man, Batman, Wonder Woman, Flash, Cyborg, Aquaman, Joker, Harley Quinn, Green Lantern, Robin, Deathstroke, Super Girl, Darkseid
Pre order
Dead pool, Batgirl
DLC 1
Rouge, Mr. Fantastic, Shadow Thief, Booster Gold
DLC 2
Falcon, Rocket and Groot, Shazam, Granny Goodness