Suggestions by @delinquentprincess

Lisa Lu

as Yan Lin in W.I.T.C.H.

Sarah Gadon

as Narcissa Black in The Marauders Era

Louis Garrel

as Severus Snape in The Marauders Era

Sofia Bryant

as Mary MacDonald in The Marauders Era

Kennedy Walsh

as Marlene Mckinnon in The Marauders Era

Beatrice laus

as Marlene Mckinnon in The Marauders Era

Florence Pugh

as Marlene Mckinnon in The Marauders Era

Fionn O'Shea

as Peter Pettigrew in The Marauders Era

Dane DeHaan

as Peter Pettigrew in The Marauders Era

Avan Jogia

as Sirius Black in The Marauders Era

Ezra Miller

as Sirius Black in The Marauders Era

Charlie Rowe

as Remus Lupin in The Marauders Era

Dev Patel

as James Potter in The Marauders Era

Bob Morley

as James Potter in The Marauders Era

Bree Kish

as Lily Evans in The Marauders Era

Karen Gillan

as Lily Evans in The Marauders Era

Teyonah Parris

as Calypso in Class of the Titans

JR Bourne

as Theresa's Dad in Class of the Titans

Leah Lewis

as Atalanta in Class of the Titans

Tunji Kasim

as Odysseus in Class of the Titans