Suggestions by @jasonyoung

Isaiah Russell-Bailey

as Dean Thomas in Harry Potter and the Prisoner of Azkaban

Rory Kinnear

as Cornelius Fudge in Harry Potter and the Prisoner of Azkaban

Rhys Darby

as Argus Filch in Harry Potter and the Prisoner of Azkaban

Ferdia Shaw

as Seamus Finnigan in Harry Potter and the Prisoner of Azkaban

Bentley Storteboom

as Neville Longbottom in Harry Potter and the Prisoner of Azkaban

Noah Jupe

as Gregory Goyle in Harry Potter and the Prisoner of Azkaban

Casey Simpson

as Vincent Crabbe in Harry Potter and the Prisoner of Azkaban

Felix Jamieson

as Draco Malfoy in Harry Potter and the Prisoner of Azkaban

Will Merrick

as Percy Weasley in Harry Potter and the Prisoner of Azkaban

Jim Broadbent

as Vernon Dursley in Harry Potter and the Prisoner of Azkaban

Olivia Colman

as Petunia Dursley in Harry Potter and the Prisoner of Azkaban

Archie Yates

as Dudley Dursley in Harry Potter and the Prisoner of Azkaban

Martin Freeman

as Arthur Weasley in Harry Potter and the Prisoner of Azkaban

Summer Fontana

as Ginny Weasley in Harry Potter and the Prisoner of Azkaban

Summer Fontana

as Ginny Weasley in Harry Potter and the Philosopher's Stone

KJ Apa

as Fred And George Weasley in Harry Potter and the Prisoner of Azkaban

Alex Kingston

as Molly Weasley in Harry Potter and the Prisoner of Azkaban

Tilda Swinton

as Sybill Trelawney in Harry Potter and the Prisoner of Azkaban

Paul Dano

as Peter Pettigrew in Harry Potter and the Prisoner of Azkaban

Ben Barnes

as Sirius Black in Harry Potter and the Prisoner of Azkaban