Most likely Gray, but I don't really know. These lyrics are from Mr. Fun computer in horror mode, just so you know!
Ok, but I wonder how the computer knew that this happy, colorful world wasn't real? Since it was also part of this world, doesn't that seem suspicious? And what about those characters who are not dead but corrupted, how can they be corrupted but they are not dead? Who corrupted them? Is that character with the black top hat icon a living or dead creature? Could it be that he corrupted those characters who are still alive?