Mr. Hat is a puppet used as a teaching assistant by Mr. Garrison, representing his repressed emotions, including homosexual and racist tendencies. Garrison actively converses with Mr. Hat, routinely blaming the hand puppet for various predicaments. Beyond the classroom, Garrison relies on Mr. Hat in much the same way. He appeared with Garrison throughout the first six seasons of the show, primarily from 'Cartman Gets an Anal Probe' until 'Summer Sucks', after which he was briefly replaced with Mr. Twig until he and Garrison made up in 'Chef Aid'; after Garrison was rehired at the school in 'The Death Camp of Tolerance', Mr. Hat was replaced as teacher's assistant by Mr. Slave. He made a cameo appearance in flashback from the episode 'Pre-School', and reappeared briefly in '200' because Cartman knew that Mr. Hat would know the truth behind Cartman's father. (Source: Fandom.com, CC BY-SA)