If you don’t know about these roles, here’s a summary:

Trey Parker: Voices Stan, Cartman, Randy, and about half the male characters.

Matt Stone: Voices Kyle, Craig, Tweek, and the other half of the male characters.

Mary Kay Bergman: Voiced all the female characters until her death in 1999.

Issac Hayes: Voiced Chef.

Matt Stone

Trey Parker does the best voices, I find. I also really like Hayes' Chef voice and Adrien Beard is great as Token.

Where's April Stewart