Suggestions by @veroctrl

Jeremy Irons

as Pollux Black in Riddle Era

Pierce Brosnan

as Arcturus Black in Riddle Era

Rachel Weisz

as Slytherin in Founders Era

Peter Capaldi

as Salazar Slytherin in Founders Era

Richard Armitage

as Salazar Slytherin in Founders Era

Olivia Coleman

as Minerva Macgonagall in Marauders Era - The Lost Generation

Olivia Coleman

as Minerva McGonagall in Marauders Era - The Lost Generation

Luke Evans

as Fenrir Greyback in Marauders Era - The Lost Generation

Ella Balinska

as Mary Macdonald in Marauders Era - The Lost Generation

Jamie Bell

as Peter Pettigrew in Marauders Era - The Lost Generation

Sadie Sink

as Lily Evans in Marauders Era - The Lost Generation

Avan Jogia

as James Potter in Marauders Era - The Lost Generation

Cat Burns

as Dorcas Meadows in Marauders Era - The Lost Generation

Lovie Simone

as Dorcas Meadows in Marauders Era - The Lost Generation

Nicholas Galitzine

as Barty Crouch Jr in Marauders Era - The Lost Generation

Lovie Simone

as Dorcas Meadows in Marauders Era - The Lost Generation

Emily Mortimer

as Hope Lupin in Marauders Era - The Lost Generation

Hannah Dodd

as Lily Evans in Marauders Era - The Lost Generation

Sophie Skelton

as Lily Evans in Marauders Era - The Lost Generation

Ellie Bamber

as Lily Evans in Marauders Era - The Lost Generation