Suggestions by @veroctrl

Joe Cole

as Albert Runcorn in Marauders Era - The Lost Generation

Alex Lawther

as Yaxley in Marauders Era - The Lost Generation

Tom Brittney

as Thorfinn Rowle in Marauders Era - The Lost Generation

Warwick Davis

as Filius Flitwick in Marauders Era - The Lost Generation

Sendhil Ramamurthy

as Reginald Cattermole in Marauders Era - The Lost Generation

Martins Imhangbe

as Dirk Cresswell in Marauders Era - The Lost Generation

Ncuti Gatwa

as Dedalus Diggle in Marauders Era - The Lost Generation

Sacha Dhawan

as Saul Croaker in Marauders Era - The Lost Generation

Sami Outalbali

as Sturgis Podmore in Marauders Era - The Lost Generation

Jacob Anderson

as Bones in Marauders Era - The Lost Generation

Suraj Sharma

as Cornelius Fudge in Marauders Era - The Lost Generation

Gugu Mbatha-Raw

as Mary Green in Marauders Era - The Lost Generation

Pearl Mackie

as Charity Burbage in Marauders Era - The Lost Generation

Jameela Jamil

as Mafalda Hopkirk in Marauders Era - The Lost Generation

Marsha Thomason

as Aurora Sinistra in Marauders Era - The Lost Generation

Dakota Blue Richards

as Dolores Umbridge in Marauders Era - The Lost Generation

Bella Ramsey

as Helena Abbot in Marauders Era - The Lost Generation

Angus Imrie

as Ellard Abbot in Riddle Era

Bella Ramsey

as Helena Abbot in Riddle Era

David Oyelowo

as Bertie Higgs in Riddle Era