Pixar Theory: Who is Riley’s Monster?

What do you think? Is he Riley’s Monster?? MoviePilot :: The D-Cast :: Hey Super Carlin Friends! ►► T-SHIRTS ►► Google Autofill Playlist ►► Theories ►► Super Carlin Gaming ►► - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - BECOME A S