Mr. Hankey the "Christmas Poo", voiced by Trey Parker, is a talking piece of feces. He first appeared in the first season episode "Mr. Hankey, the Christmas Poo". He emerges from the toilet bowl on Christmas Eve and brings presents to good boys and girls whose diets have been high in fiber. He is especially close to Kyle, consoling him during his Christmas-Hanukkah depression and generally appears to help the boys out with something or gives them advice. Mr. Hankey has appeared in various Christmas episodes, and inspired an actual retail CD Mr. Hankey's Christmas Classics in which he has his own theme song. In his first appearance, he appeared anthropomorphic only to Kyle and Chef, although he often leaves a trail behind that is attributed by the adults to antisocial behavior by Kyle. Due to his physical state, he can only emerge from the sewers during the Christmas season or he will dry up and die.
The Mr. Hankey character was based on an idea Trey Parker's father created when he was potty-training Trey as a child. Parker said he refused to flush the toilet at age three or four, so his father told him if he did not flush the stool, whom he called "Mr. Hankey", it would come to life and kill him. Parker said he planned to incorporate Mr. Hankey into South Park, but did not decide right away to make him a Christmas figure; previously, Parker envisioned the character simply as a talking stool and drew him with a sailor's hat, not a Christmas hat. John Kricfalusi, the creator of The Ren and Stimpy Show, claimed Mr. Hankey concept was stolen from Kricfalusi's cartoon short, "Nutty the Friendly Dump", and even discussed taking legal action against the show. Parker and Stone denied the allegation and said they were not fans of Ren & Stimpy.
Read more about this topic: List Of Recurring South Park Characters