Suggestions by @veroctrl

Kingsley Ben-Adir

as Tiberius Ogden in Teachers Era

Score: +1

Justice Smith

as Edgar Bones in The Freckled Era

Score: +1

Tom Blyth

as Lucius Malfoy in Marauders Era - The Lost Generation

Score: +1

Dominic Fike

as Evan Rosier in Marauders Era - The Lost Generation

Score: -2

Rafiella Chapman

as Marlene Mackinnon in Marauders Kids

Score: +1

Skai Jackson

as Dorcas Meadows in Marauders Kids

Score: +1

Alexander Molony

as Harry Potter in Trios era

Score: +1

Thandie Newton

as Minerva Macgonagall in Marauders Era - The Lost Generation

Score: +1

Nia Towle

as Minerva McGonagall in Teachers Era

Score: +1

Dua Saleh

as Minerva McGonagall in Teachers Era

Score: +1

Adjoa Andoh

as Minerva Mcgonagall in Trios era

Score: +1

Belinda Bromilow

as Great Aunt Muriel in Trios era

Score: +1

Tom Hughes

as Lord Voldemort in Marauders Era - The Lost Generation

Score: +1

Ritu Arya

as Sybill Trelawney in Marauders Era - The Lost Generation

Score: +1

Charlie Heaton

as Rufus Scrimgeour in Teachers Era

Score: +1

David Oyelowo

as Bertie Higgs in Teachers Era

Score: +1

Sacha Baron Cohen

as Tiberius Ogden in Teachers Era

Score: +1

Angus Imrie

as Ellard Abbot in Teachers Era

Score: +1

Martins Imhangbe

as Dirk Cresswell in Marauders Era - The Lost Generation

Score: +1

Dev Patel

as Ted Tonks in Marauders Era - The Lost Generation

Score: +1