Hey, what'd you put in a 4th Smash Bros. game?

I want you to tell me what you would put in a Smash Bros. four. Like stages, fighters, Subspace Army members, (I think Tabuu is the best hit of a villain the series has had. He took out the Smash Bros. in 1 hit, though Jiggly Puff, Sonic, Wolf, Ness, Luigi, King De De De, and Toon Link weren't there at the time:D And Bowser was already beaten by Ganon:P) Adventure Mode levels, Stage challenges, (things 'bout the stage that could effect the battle, like the Halberd's Combo Cannon.) stuff like that. Here are some stages I would put: Black Vortex, (Spectrobes, stage would have Swars appear, move around and hit ya if got too close, causin' small damage.) Destruction Derby 1, (Kirby Air Ride. Like the original Destruction Derby 1, you could destroy the boulders, which would come back on that game, like el towers on Brawl's Shadow Moses Island.