User blog comment:Superdupergamer12345/Steam Showdown suggestions/@comment-3445303-20130520200340/@comment-3187795-20130522012506

GLaDOS and Wheatley could be environmental things. Both narrate. GLaDOS cues things to hurt the current winner, while Wheatley cheers for the loser. This being if you have stages, where one is (A) Science. Or you could have them narrate the whole thing.