I miss Mewtwo. He was a bad a**. But they seriously need to power him up. I mean, over-powered compared to last time. They have to power up Lucario too a bit. They both suck. I also heard one kid say all the other characters from the old SSB games. I think that'd be good too.

Another Pokemon trainer with starter Pokemon from another region. Most likely the newest region they com out with. But not the same way they did the last trainer (e.i. Water Pokemon is in the first evo stage, grass second and fire third).
Megaman (X or EXE). Like Nintendo doesn't have enough of his games to put him in there. I think Megaman X might be best because all the other Megamans sound like the biggest, most annoying bitches I've ever heard. I'm being 100% honest when I say, I've heard little girls younger than 6 that sound more manlier than Megaman. But Megaman is still 1337.

OR

Zero (Megaman Zero or Megaman X series). Zero is just one of the best characters on Megaman if you ask me. Maybe if they pick the Zero from Megaman Zero, you push D-B to change weapons.

OR

And "Wolf" Link (AKA Twilight Link). He'd be a real nice and unique addition.

I woulda said Shadow but it's inevidible that he'll be in the next one.
I also woulda said Lyn (Fire Emblem). SSB needs more girl characters and she was awesome. And she'd be the first girl character to have a sword.

I'm sorry if these pictures stretched the page out. =/