User blog comment:GravityMan/Literature vs History 7: Cat in the Hat vs Bill Cipher/@comment-25872721-20160220213209/@comment-6533831-20160220232150

My guess is Zack Lightman (Armada) VS Sam Brenner (Pixels) because

Donkey Kong Barrel

Pac-Man

and the fact GM was talking about this suggestion earlier and said he was watching Pixels