Suggestions by @veroctrl

Will Poulter

as Gildenroy Lockhart in Marauders Era - The Lost Generation

Jason Momoa

as Rodolphus Lestrange in Marauders Era - The Lost Generation

Joel Fry

as Mundungus Fletcher in Marauders Era - The Lost Generation

Keira Knightley

as Andromeda Tonks (nee Black) in Marauders Era - The Lost Generation

Harry Lloyd

as Lucius Malfoy in Marauders Era - The Lost Generation

Benny Emmanuel

as Benjy Fenwick in Marauders Era - The Lost Generation

Nina Sosanya

as Bertha Jorkins in Marauders Era - The Lost Generation

Luke Newton

as Caradoc Dearborn in Marauders Era - The Lost Generation

Ncuti Gatwa

as Deadalus Diggle in Marauders Era - The Lost Generation

Katie McGrath

as Bellatrix Lestrange in Marauders Era - The Lost Generation

Sarah Gadon

as Narcissa Malfoy (Nee Black) in Marauders Era - The Lost Generation

Awkwafina

as Emma Vanity in Marauders Era - The Lost Generation

Havana Rose Liu

as Emmline Vance in Marauders Era - The Lost Generation

Malachi Kirby

as Amycus Carrow in Marauders Era - The Lost Generation

Freema Agyeman

as Alecto Carrow in Marauders Era - The Lost Generation

Jim Sturgess

as Frank Longbottom in Marauders Era - The Lost Generation

Natalia Dyer

as Alice Fortescue (Longbottom) in Marauders Era - The Lost Generation

Elliot Knight

as Broderick Bode in Teachers Era

Dakota Blue Richards

as Dolores Umbrigde in Teachers Era

Parminder Nagra

as Pomona Sprout in Teachers Era