Suggestions by @veroctrl

Josh Dylan

as Peter Pettigrew in Marauders Era - The Lost Generation

Jessica Allain

as Dorcas Meadows in Marauders Era - The Lost Generation

Sophie Okonedo

as Rosmerta in Trios era

Ann Akinjirin

as Millicent Bulstrode in Trios era

Joel Fry

as Mundugus Fletcher in Trios era

Chiwetel Ejiofor

as Alastor Moody in Trios era

Aaron Pierre

as Marcus Flint in Trios era

Will Sharpe

as Harry Potter in Trios era

Ben Barnes

as Sirius Black in Trios era

Andrew Garfield

as Remus Lupin in Trios era

Iman Vellani

as Padma Patil in Trios era

Raymond Ablack

as Harry Potter in Trios era

Nina Sosanya

as Bertha Jorkins in Marauders Era - The Lost Generation

Michael Socha

as Selwyn in Marauders Era - The Lost Generation

Eamonn Walker

as Horace Slughorn in Marauders Era - The Lost Generation

Franz Drameh

as Slughorn in Riddle Era

Franz Drameh

as Slughorn in Marauders Era - The Lost Generation

Michael Gambon

as Dumbledore in Marauders Era - The Lost Generation

Parminder Nagra

as Pomona Sprout in Marauders Era - The Lost Generation

Jane Levy

as Molly Weasely in Marauders Era - The Lost Generation