Suggestions by @redara

Laura Harrier

as Isolde Zabini in Marauders + HP

Louis Cordice

as Blaise Zabini in Marauders + HP

Dara Ó Briain

as Horace Slughorn in Marauders + HP

James McAvoy

as Ted Tonks in Marauders + HP

Cillian Murphy

as Orion Black in Marauders + HP

Jude Law

as Albus Dumbledore in Marauders + HP

Tony Cox

as Filus Flitwick in Marauders + HP

Casper von Bülow

as Evan Rosier in Marauders + HP

Christina Ricci

as Luna Lovegood in Marauders + HP

Juno Temple

as Sybill Trelawney in Marauders + HP

Havana Rose Liu

as Emma Vanity in Marauders + HP

Alisha Boe

as Emmeline Vance in Marauders + HP

Léa Seydoux

as Walburga Black in Marauders + HP

Louis Garell

as Severus Snape in Marauders + HP

Caleb Landry Jones

as Bill Weasley in Marauders + HP

Max Barczak

as Ron Weasley in Marauders + HP

Marlon Pendlebury

as Harry Potter in Marauders + HP

Louis Seriot

as Sirius Black in Marauders + HP

Taylor Russell

as Hermione Granger in Marauders + HP

Will Gao

as Timothy Stoker in The Magnus Archives