Kratos, Cole, Ratchet and Clank, Sly Cooper, Snake, and Nyx could all be awesome to play as from recent games. And if they go back to pre-PS3 games we have Persona and Xenosaga characters. Aegis Vs. KOS-MOS anyone?

And don't forget any of the Disgaea characters, or Makai Kingdom.

There are a lot of PS Exlusives that could give us some awesome characters, the problem is I doubt most of them would make the cut.