and put them in a game thats not a brawler or a fighter, what type of game would you like it to be? I think it would it would be cool to take all these AllStars and make a League of Legends/Smite/Dota type of game, the camera angle could be third person like smite, making it a little more console friendly.
But it would be cool if there was kind of an action adventure game where you play as someone (either a new character, or one of the 22 characters of this game) and you have to visit each world which has been corrupted by Polygon Man.
I've never played Kingdom of Hearts, but I imagine it to be like that. Maybe like Spyro with all of the different worlds (e.g. Kratos' world, Little Big Planet, Fat Princess's Castle, etc...).
Maybe you could play as the other characters once you save their homeworld?