Suggestions by @nickienicks

Ben Affleck

as Professor Carr in Fourth Wing

Cillian Murphy

as Major Varrish in Fourth Wing

David Tennant

as Professor Markham in Fourth Wing

Odeya Rush

as Sloane Mairi in Fourth Wing

Sabrina Carpenter

as Syrena in Fourth Wing

Sofia Carson

as Catriona in Fourth Wing

Gary Oldman

as Nolon in Fourth Wing

Keanu Reeves

as Professor Emetterio in Fourth Wing

Elle Fanning

as Tara in Fourth Wing

Tom Hiddleston

as Violet's dad in Fourth Wing

Ralph Fiennes

as King Tauri in Fourth Wing

Kristen Li

as Aurelie in Fourth Wing

Florence Pugh

as Amber Mavis in Fourth Wing

Samuel L. Jackson

as Nolan in Fourth Wing

Viola Davis

as Winifred in Fourth Wing

Ana de Armas

as Jesinia in Fourth Wing

Emily Blunt

as Sgaeyl (voice) in Fourth Wing

James McAvoy

as Tairn (voice) in Fourth Wing

Tom Holland

as Sawyer in Fourth Wing

Avan Jogia

as Bodhi in Fourth Wing