Mr. Garrison
Mr. Hat initially appeared to be simply a puppet used by Mr. Garrison as a teaching aid. However, it was soon apparent that Mr. Hat was able to perform activities that would not have been possible if he were merely a puppet. It is not entirely clear how much autonomy Mr. Hat and Mr. Garrison have from each other. In the episode "Chef Aid", Mr. Hat is able to drive a car through a prison wall to rescue Mr. Garrison and Chef, to which Chef remarks, "How the hell did he reach the gas pedal?".