Suggestions by @harrypotterfan7

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

Liza Tarbuck

as Pomona Sprout in Harry Potter

Peter Dinklage

as Filius Flitwick in Harry Potter

Tilda Swinton

as Professor Sybill Patricia Trelawney in Harry Potter

Paul Dano

as Peter Pettigrew in Harry Potter

An Unknown Child Actor

as Fred Weasley in Harry Potter