Suggestions by @veroctrl

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

Caleb Landry Jones

as Arthur Weasley in Marauders Era - The Lost Generation

Gemma Jones

as Poppy Pomfrey in Marauders Era - The Lost Generation

Maggie Smith

as Minerva McGonagall in Marauders Era - The Lost Generation

Vanessa Kirby

as Petunia Evans in Marauders Era - The Lost Generation

Cat Burns

as Dorcas Meadows in Marauders Era - The Lost Generation

Anok Yai

as Dorcas Meadows in Marauders Era - The Lost Generation

James Cromwell

as Lyall Lupin in Marauders Era - The Lost Generation

Reiky de Valk

as James Potter in Marauders Era - The Lost Generation

Sophie Thatcher

as Marlene McKinnon in Marauders Era - The Lost Generation

Sadie Sink

as Lily Evans in Marauders Era - The Lost Generation

Daisy Ridley

as Lily Evans in Marauders Era - The Lost Generation

Rachel Weisz

as Augusta Greengrass (Longbottom) in Riddle Era

Anya Chalotra

as May Greengrass in Riddle Era

Kristoff Bjorgman

as Peter Pettigrew in Marauders Era - The Lost Generation