Leopold "Butters" Stotch is a character from the cartoon "South Park." He is normally polite, mild-mannered and very positive-thinking. However, he has a "dark side" which he personifies as Professor Chaos.
Butters is often seen politely waving alongside Strider at the end of videos. In Best South Park Episodes Strider claimed that Butters was his favourite character and that he learned a lot about being a good person from him growing up.