Suggestions by @johnwestbrook64

Alyson Stoner

as Red McArthur in The Best Day Of Gumball Watterson And Kyle Broflowski

Jason Lee

as Mordecai/Rigby in The Best Day Of Gumball Watterson And Kyle Broflowski

Zach Galifianakis

as Mr Maellard in The Best Day Of Gumball Watterson And Kyle Broflowski

Christina Aguilera

as Herself in The Best Day Of Gumball Watterson And Kyle Broflowski

Megan Fox

as Wendy Testaburger in The Best Day Of Gumball Watterson And Kyle Broflowski

Ashley French-Tisdale

as Sharpay Evans in The Best Day Of Gumball Watterson And Kyle Broflowski

Darby Camp

as Anais Watterson in The Best Day Of Gumball Watterson And Kyle Broflowski

Tim Allen

as Steve Small in The Best Day Of Gumball Watterson And Kyle Broflowski

Charlie Sheen

as Benson Dunwoody in The Best Day Of Gumball Watterson And Kyle Broflowski

Katy Perry

as Katy Perry in The Best Day Of Gumball Watterson And Kyle Broflowski

Jack Black

as Jack Black in The Best Day Of Gumball Watterson And Kyle Broflowski

Jack D. Ferraiolo

as Richard Watterson in The Best Day Of Gumball Watterson And Kyle Broflowski

Rose Byrne

as Nicole Watterson in The Best Day Of Gumball Watterson And Kyle Broflowski

Matt Stone

as Kyle Broflowski in The Best Day Of Gumball Watterson And Kyle Broflowski

Zac Efron

as Gumball Watterson in The Best Day Of Gumball Watterson And Kyle Broflowski