Suggestions by @harrypotterfan7

Steve Backshall

as Zoo Director in Harry Potter

Robert Carlyle

as Argus Filch in Harry Potter

Kate Beckinsale

as Narcissa Malfoy in Harry Potter

Carey Mulligan

as Alice Longbottom in Harry Potter

David Beckham

as Ludo Bagman in Harry Potter

Kate Beckinsale

as Madam Rosmerta in Harry Potter

Christian Bale

as Sir Nicholas De Mimsy-Porpington in Harry Potter

Colin Hoult

as Edward "Ted" Tonks in Harry Potter

Rhys Matthew Bond

as Regulus Arcturus Black in Harry Potter

Asa Butterfield

as Regulus Arcturus Black in Harry Potter

Harry Lloyd

as Regulus Arcturus Black in Harry Potter

Leo Suter

as William Weasley in Harry Potter

Fionn Whitehead

as Charles Weasley in Harry Potter

Alex Lawther

as Charles Weasley in Harry Potter

Ralph Fiennes

as Voldemort (present time in the book) in Harry Potter

Kelly Macdonald

as Helena Ravenclaw in Harry Potter

Simon Fisher-Becker

as Fat Friar (Hufflepuff ghost) in Harry Potter

An Unknown Child Actor

as Dudley Dursley in Harry Potter

Tom Hollander

as Rubeus Hagrid in Harry Potter

Michelle Fairley

as Professor Minerva McGonagall in Harry Potter