I know some are very canon , don't come at me
Stan - October 19 (Libra)
Kyle - May 26 (Gemini)
Kenny - March 22 (Aries)
Cartman - July 1 (Cancer)Butters - September 11 (Virgo)
Craig - January 26 (Aquarius)
Clyde - April 12 (Aries)
Tweek - August 15 (Leo)
Tolkien - June 12 (Gemini)Jimmy - May 2 (Taurus)
Bebe - August 13 (Leo)
Wendy - December 18 (Sagittarius)
Nichole - February 24 (Pisces)
Red - November 6 (Scorpio)Heidi - December 10th (Sagittarius)