Suggestions by @harrypotterfan7

Keira Knightley

as Andromeda "Dromeda" Tonks (née Black) in Harry Potter

Ruth Wilson

as Dolores Jane Umbridge in Harry Potter

Sean Bean

as Alastor Moody in Harry Potter

Richard Coyle

as Aberforth Dumbledore in Harry Potter

Paul Bettany

as Xenophilius Lovegood in Harry Potter

Samantha Morton

as Alecto Carrow in Harry Potter

Will Keen

as Amycus Carrow in Harry Potter

Mark Addy

as Vernon Dursley in Harry Potter

Sam Taylor-Johnson

as Petunia Dursley (née Evans) in Harry Potter

Naomi Watts

as Narcissa Malfoy in Harry Potter

Tom Hardy

as Fenrir Greyback in Harry Potter

Peter Capaldi

as Rufus Scrimgeour in Harry Potter

Stephen Fry

as Horace Slughorn in Harry Potter

Eva Green

as Bellatrix Lestrange in Harry Potter

Millie Bobby Brown

as Nymphadora Tonks in Harry Potter

Idris Elba

as Kingsley Shacklebolt in Harry Potter

Chiwetel Ejiofor

as Kingsley Shacklebolt in Harry Potter

Elizabeth Moss

as Dolores Jane Umbridge in Harry Potter

Rosamund Pike

as Rita Skeeter in Harry Potter

Martin Freeman

as Arthur Weasley in Harry Potter