http://en.wikipedia.org/wiki/Kenny_McCormick wrote:
<<Kenny ("aristarchusinexile"
) McCormick is a nine-year-old fourth-grade student living with his relatively poor family in the fictional town of South Park, Colorado. Kenny is fond of toilet humor and pornography, and when it comes to sexually-related subjects, he is the most knowledgeable of the group. Others will typically ask for his explanation of sexual matters unknown to them. Kenny's lechery is also one of his prominent characteristics; his bedroom walls are frequently shown to adorn posters of bikini-clad models, and he has lusted over several girls and women over the course of the series, while also having dated two fellow female students.
Kenny's parka hood is always tightly drawn, leaving only his eyes (and un-animated nose) exposed. Sometimes, when he is frightened, he will tighten the cords on his hood to hide even more of his face. As a result, all of Kenny's spoken lines are heavily muffled. While his friends understand him easily, adult residents often have problems understanding Kenny's speech, requiring the others to translate for him. The effect of Kenny's speech is achieved by Stone mumbling into his own hand as he provides Kenny's lines. As the technique of Kenny's muzzled enunciation frequently implies, many of his lines are indeed profane and sexually-explicit, the lengthier of which are mostly improvised by Stone. Closed-caption encoding depicts Kenny's speech as if it were intelligible.
He first appeared unobscured by the hood in South Park: Bigger, Longer & Uncut, where it was revealed that he had messy blond hair. In a cameo appearance during this moment in the film, Mike Judge provided the voice for Kenny's one line of uninsulated dialogue.
Kenny gets along generally well with his friends Stan and Kyle. Kenny's friendship with Cartman is more complex. Cartman often teases Kenny about his poverty, with Kenny usually reacting angrily. Kenny wrote in his will that he did not like Cartman, but "felt sorry" for him. On the other hand, it has been indicated that Kenny and Cartman consider themselves to be best friends. The two are often the only ones to laugh at the other's jokes or antics.
Prior to season six, Kenny died in almost every episode, with only a few exceptions. This was often followed by the catchphrase "Oh my God, they killed Kenny! ...You bastards!" (or some variation of it), usually said by Stan and Kyle, respectively. Stone and Parker revealed that when Stan or Kyle would exclaim "they" and "you bastards" to apparently no one in particular, they are actually referring to Stone and Parker themselves, as though they were an omnipresence within the show's universe. It was also common for a number of rats to suddenly appear and begin picking at his corpse.
Following his death in "Kenny Dies", he failed to reappear in several of the following episodes, having seemingly been killed off for good by the show's creators. Despite this, Kenny returned to the show less than one year later, first as a spirit possessing Cartman in "A Ladder to Heaven", then as his old self in "Red Sleigh Down". Since then, Kenny has died in only a small number of episodes, most recently in the Season 13 premiere where he died of syphilis.
In the book South Park and Philosophy: Bigger, Longer, and More Penetrating, an essay by Southern Illinois University philosophy professor Dr. Randall Auxier, entitled "Killing Kenny: Our Daily Dose of Death", suggests that the fashion of the recurring gag serves to help the viewer become more comfortable with the inevitability of their own death.>>