Crow-kun as it appears in the game
Crow-kun (a name coined by PewDiePie) is a crow which Aya uses to save on in the game Mad Father. Whenever PewDiePie sees it in the game, he will immediately go over to save on it while singing the "Save Crow" song, which is a modified version of the "Save Station" song PewDiePie uses in his Dead Space 2 playthrough. If he does not sing, then PewDiePie will go over and say: "Sup, Crow-Kun?"