Suggestions by @mr95

Richard Dormer

as Alastor Moody in Harry Potter

Angus Imrie

as Remus Lupin in Harry Potter

Thomas Brodie-Sangster

as Gilderoy Lockhart in Harry Potter

Riz Ahmed

as Firenze in Harry Potter

Juno Temple

as Sybill Trelawney in Harry Potter

Anita Dobson

as Ponoma Spout in Harry Potter

Leigh Gill

as Filius Flitwick in Harry Potter

Kristian Nairn

as Rubeus Hagrid in Harry Potter

Matt Lucas

as Quirinus Quirrell in Harry Potter

Ruth Gemmell

as Minerva McGonnagal in Harry Potter

Anthony Hopkins

as Albus Dumbledore in Harry Potter

Tamara Smart

as Angelina Johnson in Harry Potter

Jordan A. Nash

as Blaise Zabini in Harry Potter

Maariya Razzaq

as Parvati & Padma Patil in Harry Potter

Jayde

as Lavender Brown in Harry Potter

Billy Jenkins

as Cedric Diggory in Harry Potter

Sadie Victoria Lim

as Cho Chang in Harry Potter

Noah Cottrell

as Dean Thomas in Harry Potter

Lee Thomas Harwood

as Seamus Finnigan in Harry Potter

ebony louise

as Pansy Parkinson in Harry Potter