United Front has said that due to the positive reaction over the God of War, LBP, and Uncharted characters in ModNation Racers pre-orders, the devs are curious over who else you would like to see make an appearance.
Speaking with CVG, game director William Ho said the team was thrilled when game creators allowed their characters to appear in the racer, and are planning to add more in the future.
"We're very keen to investigate what videogame heroes people want to see in ModNation Racers," he said. "We were thrilled when the creators of God of War, Ratchet & Clank and LittleBigPlanet wanted to see their characters in the ModNation universe.
"So I think there's been such a positive response to that, that I'd be surprised if we didn't see more in the future."
ModNation's out tomorrow in the UK, and May 25 in the US.