Mr. Hankey

Mr. Hankey is the Christmas deity of South Park, taking the place of others, such as Frosty or Rudolph. He is a jolly Poo that visits anyone on Christmas that has a lot of high fiber in their diets. He resides in the sewers beneath South Park, and therefore has been known to appear as if by magic from out of toilet cisterns, bringing with him tidings of joy, and a ghastly smell. He was also voiced by Trey Parker the co-creator of South Park.

Background
Mr. Hankey made his first appearance in "Mr. Hankey, the Christmas Poo" and was seen as generally unknown to the other characters besides Kyle Broflovski and Chef, but after the episode's events he was popularized and by "Merry Christmas Charlie Manson!" there are several TV specials about him and he even takes a more Santa-esque role at malls, but he makes no actual physical appearance in the episode. In "Chef's Chocolate Salty Balls" the boys meet him in the sewer and he explains how the Hollywood people, led by Robert Redford were destroying the ecosystem. Kyle's and his calls are ignored and turned into a movie starring Tom Hanks called "Mr. Hankey and Me", and Mr. Hankey eventually dies. Using Chef's Chocolate Salty Balls to revive him, he uses poo magic to get rid of Redford.

Mr. Hankey hosts "Mr. Hankey's Christmas Classics", which features a new rendition of his theme song. He returns for "A Very Crappy Christmas" in which we meet his a wife Autumn, who has a drinking problem. We are also introduced to their three kids: Cornwallis, Amber, and Simon (who was born with a peanut in his head) Mr. Hankey later sings "Circle of Poo" with Corwallis and helps the boys make their Christmas short. He reappears briefly in "Red Sleigh Down" with his poo-choo train. This was his final appearance in the series until "201" when he is revealed to have orchestrated the previous episode's plot to hide Santa Claus in a Bear costume instead of Muhammad.

He is also mentioned in "Pre-School" by Trent Boyett.

He also appeared in "I Should Have Never Gone Ziplining", where he was seen rescuing the boys from extreme boredom on the boat they were on. He took them away in his magical "Helicrapter". After travelling so far, Hankey took the boys further on his "Seven Turdy Seven". From there, Hankey took the boys home on an hour long ride on the Poo-Choo Express.