April Stewart  April Stewart (born April 1, 1969) is an American voice actress. Stewart is best known for providing the voices of several female characters in the animated comedy series "South Park" alongside fellow voice actress Mona Marshall. She is the voice of Wendy Testaburger, Liane Cartman, Sharon Marsh, Carol McCormick, Shelley Marsh, Mayor McDaniels, Principal Victoria and others. She is also the voice of Maria Rivera on Nickelodeon's "" and the voice of Raava and Fire Lord Izumi in "The Legend of Korra". She also voiced Bloody Mary, the main antagonist of the video game "". Born and raised in Truckee, California, Stewart started acting at the age of 12. Her father, Freddie Stewart, was a singer with the Tommy Dorsey Orchestra. She gave birth to her first child, a daughter, in 2008.