In the show, Butters Stotch is a generally good-natured, anxious little boy who inevitably ends up getting thrown into extremely fucked-up situations (like being almost murdered by his parents or accidentally causing the murder of the Kardashians). As it turns out, Butters wasn’t added to the show out of a desire to have a more rounded cast – it was the creators’ way of messing with their co-worker. Apparently, as they worked on the show, Stough started getting on Parker and Stone’s nerves with his mild-mannered demeanor and unbearable politeness, so they began picking on him. They’d call him “our little buddy” (which over the years morphed into Butters), mock his voice, and generally do everything short of trapping him inside a locker.
It was only a matter of time before they decided to take this heart-warming instance of workplace bullying to the next level by turning Stough into a character for the other kids to torment. Basically, Butters is Stough if he was an eight-year-old who inexplicably lacked a nose and ears.
While he was firmly opposed to the idea at first, and specifically told Parker and Stone not to add him to the show, today Stough seems to regard Butters’ existence as a harmless bit of friendly ribbing. Yeah, you know, that classic prank where your friends tell millions of people your dad cheats on your mom with other men and they’re both terrible people who psychologically abuse you on a daily basis.