Role in South Park
Kenny attends South Park Elementary as part of Mr. Garrison's fourth grade class. During the first 58 episodes, Kenny and the other main child characters were in the third grade. Kenny comes from a poor household, presided over by his violent, alcoholic, unemployed father, Stuart McCormick. His mother Carol McCormick has a job washing dishes at the Olive Garden. Kenny has an older brother named Kevin. He also has a younger sister who is shown with his family in the season nine episode "Best Friends Forever", but does not appear until the 15th season episode "The Poor Kid", where her name is revealed to be Karen, whom he loves unconditionally. Kenny is friends with Stan, Kyle, Cartman, and Butters. Kenny is regularly teased for living in poverty, particularly by Cartman.
Kenny's superhero alter ego, Mysterion, first appeared in the Season 13 episode "The Coon", as a rival to Eric Cartman's eponymous superhero alter ego. He unmasks himself at the end of the episode, but his identity is left intentionally ambiguous. He is not revealed to be Kenny until the Season 14 episode "Mysterion Rises", the character's third appearance as part of a story arc.