Suggestions by @jaidynalexander

Gemma Arterton

as Helena Ravenclaw in Harry Potter

Hugh Grant

as Sir Cadogan in Harry Potter

Matt Lucas

as The Fat Friar in Harry Potter

Ian McShane

as The Bloody Baron in Harry Potter

Bella Ramsey

as Moaning Myrtle in Harry Potter

Jennifer Coolidge

as The Lady In The Portrait in Harry Potter

Lily James

as Lily Potter in Harry Potter

Aaron Taylor-Johnson

as James Potter in Harry Potter

Paul Dano

as Peter Pettigrew in Harry Potter

James McAvoy

as Sirius Black in Harry Potter

Celia Imrie

as Madam Hooch in Harry Potter

Hannah Waddingham

as Professor Trelawney in Harry Potter

Stephen Fry

as Professor Slughorn in Harry Potter

Stephen Fry

as Professor Slughorn in Harry Potter

Olivia Colman

as Professor Slughorn in Harry Potter

Olivia Colman

as Umbridge in Harry Potter

Alfred Molina

as Moody in Harry Potter

Andrew Garfield

as Lupin in Harry Potter

Nicholas Hoult

as Professor Lockhart in Harry Potter

Rami Malek

as Professor Quirrell in Harry Potter