Kenny is the most famous immortal in South Park, but there are 3 others. One is Osama bin Laden, one is Jesus and the other is Lizzy. Lizzy is a female version of Kenny in many forms. A bear dragged her off screen at the end of Cartmans silly hate crime 2000 but later returned as a background character (But she may have just been a lucky survivor.) Jesus was killed in Red Sleigh Down but came back. And Osama bin laden has been killed quite a few times, with a running gag stating that 'we've got him' every time he dies.