Suggestions by @jaidynalexander

Hannah Waddingham

as Madame Maxime in Harry Potter

Gillian Anderson

as Rita Skeeter in Harry Potter

Deep Roy

as Professor Flitwick in Harry Potter

Sarah Paulson

as Professor Trelawney in Harry Potter

Viola Davis

as Professor McGonagall in Harry Potter

Michelle Yeoh

as Professor McGonagall in Harry Potter

Eva Green

as Bellatrix Lestrange in Harry Potter

Angelina Jolie

as Bellatrix Lestrange in Harry Potter

Paul Bettany

as Xenophilius Lovegood in Harry Potter

Asa Butterfield

as Bill Weasley in Harry Potter

Cillian Murphy

as Lucius Malfoy in Harry Potter

Billy Magnussen

as Ludo Bagman in Harry Potter

Martin Freeman

as Arthur Weasley in Harry Potter

Sally Hawkins

as Molly Weasley in Harry Potter

Jonathan Pryce

as Ollivander in Harry Potter

Tom Hollander

as Mundungus Fletcher in Harry Potter

Jennifer Saunders

as Marge Dursley in Harry Potter

Lucy Punch

as Petunia Dursley in Harry Potter

Rory Kinnear

as Vernon Dursley in Harry Potter

Tom Holland

as Cedric Diggory in Harry Potter