Motaro from Mortal Kombat 3, Abyss from Marvel vs Capcom 2: New Age of Heroes, or Tabuu from Super Smash Bros. Brawl!
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There isn't going to be any DLC for Marvel vs Capcom 3. They are
releasing a new game full of new content called "Ultimate" Marvel
vs Capcom 3
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Lego Batman 2: DC Super Heroes, X-Men: The Arcade Game, Marvel:
Ultimate Alliance 2, X-Men Origins: Wolverine, Marvel vs. Capcom 2:
new Age of Heroes, and Batman: Arkham City are all available for
the Playstation 3.