Who Is Mysterion?

Who Is Mysterion? was a commonly asked question among South Park fans between March 2009 and November 2010, referring to the secret identity of the superhero Mysterion, first introduced in "The Coon". The initial episode did not reveal the character's true identity, which Matt and Trey insisted was a secret, instead utilizing a meta-joke about the show's minimalist animation style to suggest it was any of five children in Mr Garrison's fourth grade classroom. This lead to intensive speculation and fan theories.
The evidence offered in the episode directly confirms that Mysterion attended Garrison's class, was male, and was someone Cartman had mentioned earlier in the episode, limiting it to Kyle Broflovski, Stan Marsh, Kenny McCormick, Craig Tucker and Clyde Donovan. Kyle had been seen alongside Mysterion in his home, though Cartman was not aware of this. Professor Chaos also includes Kevin Stoley and Jason White as possible suspects, while eliminating Cartman, Jimmy Valmer, Timmy Burch and Tolkien Black.
Anecdotal evidence suggests that Kenny and Clyde were the most popular choices, the latter as a result of Clyde having been seen asleep in class which was often atributed to him being up late on hero patrol. Craig was also used in at least one fanfic.
After "Coon 2: Hindsight" aired, Stan was identified as Toolshed, but the identities of Mysterion, the Human Kite, Mosquito and Mint-Berry Crunch remained unconfirmed, with Kyle, Clyde, Kenny and Bradley Biggle among the members of Coon and Friends seen out of costume.
Promotion for "Mysterion Rises" teased that the character's identity would finally be revealed, and an online poll at South Park Studios asked fans to vote who it could be, including the above characters and DogPoo Petuski as candidates. The episode would finally reveal his identity to be Kenny McCormick, which Matt and Trey subsequently revealed they had decided when the original "The Coon" episode aired, contradicting previous statements they had never decided on his idedentity.
Category:Canon storylines