Suggestions by @declandaly

Russell Crowe

as Vernon in Harry Potter

Rick Ross

as Dudley in Harry Potter

Amy Schumer

as Petunia in Harry Potter

Adam Sandler

as Nevil in Harry Potter

Robert Pattinson

as Cedric in Harry Potter

Pete Davidson

as Draco in Harry Potter

Joe Pesci

as Snape in Harry Potter

RuPaul

as Hagrid in Harry Potter

Gary Busey

as Dumbledore in Harry Potter

Jimmy Fallon

as Dobby in Harry Potter

Carol Baskin

as McGonagall in Harry Potter

Dwayne Johnson

as Voldemort in Harry Potter

Ashley Olsen

as Fred in Harry Potter

Mary-Kate Olsen

as George in Harry Potter

Mary Elizabeth Winstead

as George in Harry Potter

Jessica Alba

as Hermione in Harry Potter

Michael J. Fox

as Ron in Harry Potter

Peter Dinklage

as Ron in Harry Potter

Jack Black

as Harry in Harry Potter