Question: What protagonist in the thirteenth season of "South Park" has an oft-muffled and indiscernible speech?

Context paragraphs:
Kenny McCormick: Kenneth "Kenny" McCormick is a main character in the animated adult television series "South Park", along with his friends Stan Marsh, Kyle Broflovski, and Eric Cartman.  His oft-muffled and indiscernible speech—the result of his parka hood covering his mouth—is provided by co-creator Matt Stone.  He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Stone and long-time collaborator Trey Parker in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").

Pinewood Derby (South Park): "Pinewood Derby" is the sixth episode of the thirteenth season of the American animated television series "South Park".  The 187th overall episode of the series, it originally aired on Comedy Central in the United States on April 15, 2009 and in the United Kingdom on April 17, 2009.  In the episode, Randy helps Stan cheat in a pinewood derby race, which inadvertently leads to the discovery of alien life.  When an alien gangster visits South Park and the residents come into possession of his stolen "space cash", they decide to keep it for themselves and hide it from alien police officers who are looking for it.

South Park (season 13): The thirteenth season of "South Park", an American animated television comedy series, originally aired in the United States on Comedy Central between March 11 and November 18, 2009.  The season was headed by the series creators Trey Parker and Matt Stone, who served as executive producers along with Anne Garefino.  The season continued to focus on the exploits of protagonists Stan, Kyle, Cartman, Kenny and Butters in the fictional Colorado mountain town of South Park.

American Idol (season 13): The thirteenth season of "American Idol", styled as American Idol XIII, premiered on the Fox television network on January 15, 2014.  Ryan Seacrest returned as host for his thirteenth season.  Keith Urban was the only judge from the twelfth season to return.  Former judge Jennifer Lopez, who returned after one season absence, and Harry Connick, Jr. joined the judging panel following the departures of Mariah Carey, Nicki Minaj and Randy Jackson.

Fishsticks (South Park): "Fishsticks" is the fifth episode of the thirteenth season of the American animated television series "South Park".  The 186th overall episode of the series, it was originally broadcast on Comedy Central in the United States on April 8, 2009.  In the episode, Jimmy writes a joke that becomes a national sensation, and Cartman tries to steal the credit while rapper Kanye West is the only person in the country who fails to get the joke, but cannot admit that he does not get it because he believes himself to be a genius.

Dances with Smurfs: "Dances with Smurfs" is the thirteenth episode of the thirteenth season of the American animated television series "South Park".  The 194th overall episode of the series, it originally aired on Comedy Central in the United States on November 11, 2009.  In the episode, Eric Cartman becomes the reader of the elementary school announcements, and starts making politically charged accusations against student body president Wendy Testaburger The episode was written and directed by series co-creator Trey Parker, and was rated TV-MA L in the United States and M (as) in Australia.

Eat, Pray, Queef: "Eat, Pray, Queef" is the fourth episode of the thirteenth season of the American animated television series "South Park".  The 185th overall episode of the series, it originally aired on Comedy Central in the United States on April 1, 2009.  In the episode, the men and boys of South Park become infuriated when the fart-joke oriented "Terrance and Phillip" show is replaced with the "Queef Sisters", a show devoted to queef jokes.  The women and girls of South Park accuse them of holding a sexist double standard when it comes to women queefing and men farting.

Dead Celebrities: "Dead Celebrities" is the eighth episode of the thirteenth season of the American animated television series "South Park".  The 189th overall episode of the series, it originally aired on Comedy Central in the United States on October 7, 2009.  In the episode, Ike is haunted by the ghosts of dead celebrities until Michael Jackson, who refuses to accept death, possesses him.

Pee (South Park): "Pee" is the thirteenth season finale of the American animated television series "South Park".  The 195th overall episode of the series, it originally aired on Comedy Central in the United States on November 18, 2009.  In the episode, the boys visit Pi Pi's Splashtown waterpark, where so many people urinate in the pools that the entire park becomes engulfed in tsunamis of urine.

Fatbeard: "Fatbeard" is the seventh episode of the thirteenth season of the American animated television series "South Park".  The 188th overall episode of the series, it originally aired on Comedy Central in the United States on April 22, 2009 and in the United Kingdom on April 24, 2009.  It was the mid-season finale, marking the final "South Park" episode for six months.  In the episode, Cartman misinterprets news reports about piracy in the Indian Ocean to mean the return of the classic era of swashbuckling pirates, and misleads a handful of South Park boys to voyage to Mogadishu to start a pirate crew.

Supporting paragraphs: South Park (season 13) Kenny McCormick
Answer: Kenneth "Kenny" McCormick