Josef "Sef" Furman was an 18-year-old South Park fan from Plano, Texas who suffered from brain cancer. With the help of the Make-A-Wish Foundation and the creators of the show, he made a guest appearance in "The Pandemic Special".
Sef passed away on 26 November 2020, almost two months after "The Pandemic Special" aired.
Sef Furman appears in Mrs. Nelson's 4th-grade Zoom class and is later seen in quarantine with the rest of the school.
Sef Furman has black glasses and wears a black short-sleeved shirt, red shorts, and black shoes. In an interview, his father said that the creators designed the character to resemble Sef's real-life appearance.
- He is the fourth South Park fan to guest star on the show. The others were Alex Glick who appeared in "Red Man's Greed", Matthew Klinner who appeared at the end of the title sequence for "Sexual Healing", and Hugh who appeared in a few episodes of Season Twenty-Two.