Whoever the next character is, I feel like they'd be somewhat big. This was intended to be an E3 reveal, so they'd probably hit us with their best.
-The trailer starts with a shot of Dharkon and Galeem fighting each other during the Final Battle, the entirety of the roster and the Hands are shown fighting against all the bosses and an army of Puppet Fighters-
-The 81 characters by then are shown to attack with bravery, spirits floating by their side to assist them, but not even their numbers and abilities can do a thing against the gigantic armies of light and dark who are also battling against the other-
-The camera focuses on Mario, who delivered a punch to a Ryu puppet while a K. Rool one tries to strike him, but Mario manages to sweep it off via a kick. Things seem to be doing well for him, until he is struck by a bunch of missiles, to his horror, puppets of Samus, Dark Samus, Mega Man and the Mii Gunner are all pointing their armed cannons at him, and are charging attacks-
-Things are getting more dire, as he sees Lucas and Cloud have been grabbed by Galleom and Rathalos has R.O.B. and Wii Fit Trainer held by its thalons, as more of the fighters fall, Mario looks up at his attackers, and closes his eyes to prepare for the worst-
-Instead, he heard something crashing, and opens his eyes to see a figure that is still unrevealed to be on top of the now defeated Mega Man puppet, who proceeds to bounce off the heads of the Samus, Dark Samus and Mii Gunner ones as well, confusing them and allowing the new presence to beat them all with a series of punches and kicks, then throws their bodies to Galleom and Rathalos with enough strength from them to balance off and loose their grip on the fighters they held. The new fighter goes to Mario and offers his hand to help him up-
-"Come on, we got to beat these, old buddy!" he says, but Mario is in doubt, to which the fighter speaks once more "Gee, you serious? I thought after all those years of plumbing you'd not be a chicken, are you afraid of those idiots? If not, put up a fight! And now with me here..."-
-The fighter reveals a Smash envelope, and as the camera reveals who he is, and with a confident smirk he says...-
"What could possibly go wrong?"