Mr. Hat

Mr. Hat is a puppet worn on Herbert Garrison's hand and Mr. Garrison appears to converse with it. Mr. Hat was used by Mr. Garrison from "Cartman Gets an Anal Probe" until "Summer Sucks", (Where he was replaced with Mr. Twig), and then from the end of "Chef Aid" to his last appearance in "A Ladder to Heaven". He was replaced by Mr. Slave in the episode "The Death Camp of Tolerance" and since he has only made one cameo appearance in the episode Pre-School in a flashback, He has returned to the show in the episode 200 because Cartman knows he could know the truth behind his father.

Appearance
Mr. Hat was a puppet who resembled a person's torso and head with the puppet wearing a purple shirt, a brown beard and mustache and a tall red and white hat which his eyes were placed on. In "Cartman Gets an Anal Probe" Mr. Hat doesn't have eyes. In "Weight Gain 4000" he has eyes.

Biography
Mr. Garrison appears to have had Mr. Hat since he was a child as seen in the episode "Weight Gain 4000". Mr. Garrison uses Mr. Hat to channel his homosexual emotions and thoughts through even when he accepted he was gay. Mr. Garrison often blames Mr. Hat for something unethical such as being a racist and appearing with the KKK protesters in "Chef Goes Nanners" and chasing Principal Victoria's ass in "Two Guys Naked in a Hot Tub".

Real or Not?
Some people remain undecided whether Mr. Hat is a real living character or merely a puppet. Here is a list of reasons for.

For:
 * Manages to jailbreak Chef and Mr. Garrison by ramming an SUV into the jail wall in "Chef Aid".
 * Attempts to destroy Mr. Twig by boiling him and snapping him, also in "Chef Aid". However, this could have been Mr. Garrison's unconscious behavior.
 * When Mr. Garrison refuses to take Mr. Hat to the KKK rally, he disappears off Garrison's hand and appears at the meeting anyway in "Chef Goes Nanners".
 * His eyes begin to glow and his head rotates in "Weight Gain 4000" although it may have been a dream that Mr. Garrison was having.
 * In "World Wide Recorder Concert", Mr. Hat gets into a fight with Mr. Mackey (during which he is separated from Mr. Garrison) and wins, although Mr Mackey could have simply been playing into the Garrison's psychosis.
 * In the Season 2 episode "Summer Sucks" Mr. Hat appears in a sauna room with |Brett Farve and he blinks and looks at Brett without anyone holding him. Farve meanwhile seem to treat Mr. Hat as an actual person, greeting him warmly.
 * At the end of the episode "Cartman's Mom is Still a Dirty Slut" his mouth can be seen if you look closely.

Trivia

 * Mr. Hat is a KKK member.
 * Mr. Hat was a boss in the South Park video game for the N64. He operated a robot vehicle, without Mr Garrison anywhere near.