I'll tell ya who should be in the next SSB; Ninten/Ana, Teddy, and/or Poo from Earthbound Zero and 1. Ninten or Ana should be like Ness or Lucas-- but with COMPLETELY different movesets! HOw about PK Beam instead of Fire? Freeze should be there too, but not like PK Flash. It should be like an aimable line of ice that explodes on whoever's hit and then freeze them. They also need PK Shield instead of Magnet, because it could be like a mirror shield that protects you and your allies. Thunder should also be more like a scatter of lightning bolts from above, and should be like a mini PK Starstorm. which brings me to the final smash: PSI Block. It should prevent opponents from attacking and limit them to movement and jumping.
Teddy should be like a swordsman, with the ability to summon B.B. Gang members. His final smash should either be summoning EVE the robot, or getting the giant tank to try and knock out everyone, and then explode on him.
Poo should be like a combination of Link's sword, and Ness' PSI Powers. Instead of PSI Flash, Freeze, or a PSI power as a standard move, he oughta get Mirror, which temporarily turns him into a targeted enemy. He should also get PSI Brainshock, Thunder, and Fire. His final smash should also be Starstorm, since it's his signature move. Which reminds me, Ness should have Rockin as his final smash, since it's his signature move.
Other than that,Maxwell, from Scribblenauts.