It's tempting to imagine Kevin Butler's in-game stint as the VP of Special Attacks, but these characters aren't necessarily playable. The game is full of cameos, like Captain Quark in the background of a Ratchet & Clank level. We're asking Sony to clarify this information. Kevin Butler would tell us, if he existed.
Update: For its part, Sony said it didn't set up the IMDB page. And since IMDB listings can be edited by users, it's entirely possible it was fabricated by a dreamy-eyed fan hoping to will this into existence.