Seth MacFarlane
Seth MacFarlane plays the roles of Peter Griffin, Brian Griffin, Stewie Griffin, Dr. Hartman, Seamus, Tom Tucker, Glenn Quagmire and Carter Pewterschmidt.
Alex Borstein
Alex Borstein plays the roles of Lois Griffin, Tricia Takanawa, Loretta Brown, Barbara Pewterschmidt, and Maurgerite Pewterschmidt.
Seth Green
Sadly, Seth Green only plays the role of Chris Griffin and currently play roles in his own animated series "Robot Chicken".
Mila Kunis
Mila Kunis plays the role of Meg Griffin.
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Lacey Chabert
Lacey Chabert is the understudy for Mila Kunis' character.
Mike Henry
Mike Henry plays the roles of Mr. Herbert, Cleveland Brown, Greased Up Deaf Guy, Consuela, Bruce and Cleveland Brown, Jr. For a short period of time, he left Family Guy an started his on animated series called "The Cleveland Show", which airs on FOX, TBS, Cartoon Network, and Adult Swim
Adam West
Adam West plays the role of Mayor West. He also played the role as Cat Man in the animated series "The Fairly OddParents" on Nickelodeon.
Patrick Warburton
Patrick Warburton currently plays the role Joe Swanson.