His unique muffled voice is accomplished by his voice actor Matt Stone, speaking into his cupped hand. He speaks clearly and without his hood in "South Park: Bigger, Longer & Uncut", "The Jeffersons", "Lice Capades", and "Mysterion Rises" with proper, unmuffled lines.
Almost all of the time, Kenny wears a hood that muffles his speech. Kenny being muffled is how he gets away with inappropriate and vulgar speech without having to be bleeped out or censored.
But usually, his face is slightly obstructed, or his hair is covered, or you only see him from behind, etc. As of now, there's no episodes that show him totally, completely, face-and-hair-fully-out and voice unmuffled. (For that treat, you need to check out the South Park Movie: “Bigger, Longer, and Uncut”).
How do they record Kenny's voice? "Matt Stone records Kenny's dialogue by talking into his sleeve or hand." As for where the voice came out of, it is said that the duo went to school with a friend who had a big orange jacket and you guessed it, the two could hardly understand what he was saying half the time.
It was just a gag, and after each episode the show was returned to a status quo. In the 14th season of the show however it is revealed that in actuality Kenny is born again after each of his deaths and quickly grows to a 10 year old form, and the rest of the town has no memory of his death.
Sometimes they do, sometimes they don't. But mostly they don't remember, like in The Coon trilogy you see that Kenny/Mysterion dies right in front of Stan and the others, when he woke up on his bed the next morning Stan and the others said that he ran away.
His unique muffled voice is accomplished by his voice actor Matt Stone, speaking into his cupped hand. He speaks clearly and without his hood in "South Park: Bigger, Longer & Uncut", "The Jeffersons", "Lice Capades", and "Mysterion Rises" with proper, unmuffled lines.
Well, almost no-one. In the 'Coon and Friends' trilogy, a parody of superhero film franchises, it was confirmed that Kenny's immortality is a result of his parents formerly attending Cthulhu cult meetings: every time he dies, his mother rebirths him and he quickly grows back to the same age.
However, Kenny always returns alive and well the next episode, and his death is rarely addressed, but there's one character who seems to be aware of how his friend with the orange parka always dies: Cartman.
Mackey's head is so large because he wears his tie too tight. Without it on, his head is the size of Timmy Burch's.
Kenny the Shark - Season 2 Episode 5: Kenny the Movie / Goodbye Ol' Chum - Metacritic.
One of Jenny's storylines in season two was her revelation of being sexually abused as a child. The events were portrayed in a series of flashbacks and dream sequences.
Generally Kyle has green eyes, Kenny has blue eyes and Cartman has brown eyes, at least from what I've seen.
As a result of his parents' teenage Cthulhu-worshipping ways, Kenny is cursed to be an immortal abomination. Every time he is killed, his mother births a new baby Kenny who then ages rapidly to his 8-year-old form, ready for his next adventure.
A grave for South Park character Kenny McCormick appeared at a housing project in central Russia, apparently as a promotional stunt for the project, which is also named South Park. The fake gravestone installed at the entrance to the residential complex in Kazan read, “Kenny McCormick.
Although Kenny eventually returned in the season six finale to reclaim his spot among Stan, Kyle and Cartman, his deaths have become less frequent. He still dies eventually -- most recently during the show's pandemic special -- but those incidents feel more like special throwbacks to the show's early days.
Kenny's soul is trapped inside Cartman's body until it is exorcised into a pot roast, which is eaten by Rob Schneider, who subsequently dies.
In total Kenny was killed or shown as being dead 97 times across 86 different episodes of 247 episodes. For the first five seasons Kenny died a lot: 78 times in 79 episodes. Later seasons have been lighter on the joke, typically showing between one and three deaths.
Everyone in the hospital room agrees with Kyle and quietly leaves, allowing Kenny to die. Kenny returns to Heaven just in time to command the angels to victory using a golden PSP.
The muffled-voiced, parka-wearing kid of the group died in every episode until his "permanent" death in season five. While the character has reappeared since and still dies occasionally, the joke is no longer a staple of every episode. The reason why is quite simple -- the show's creators got sick of killing Kenny.
Yep, that's Kenny's tombstone in the opening credits. It reads: "Sleep well, little child. The Lord holds thee now."