If Xbox were to make a “Smash Bros.” type game, what characters would you want to see in it? Also, who would you want to develop it?

I know folks think that Xbox characters should just be added to Killer Instinct or a hypothetical sequel, but I really hope that doesn’t happen. IMO that takes away some of the identity of KI, making it more about the spectacle of seeing what they can fit in. Both an Xbox Smash and a proper KI 2 should happen instead!