Suggestions by @gabriel80s

Michael Rosenbaum

as Voldemort in Harry Potter TV Series

Matthew Goode

as Quirrell in Harry Potter TV Series

Jennifer Connelly

as Minerva McGonagall in Harry Potter TV Series

Geoffrey Rush

as Albus Dumbledore in Harry Potter TV Series

Clancy Brown

as Mr Borgin in Harry Potter MAX series

Amy Acker

as Irma Pince in Harry Potter MAX series

Peter Capaldi

as Cuthbert Binns in Harry Potter MAX series

Luke Evans

as The Bloody Baron in Harry Potter MAX series

Sofia Mattsson

as The Grey Lady / Helena Ravenclaw in Harry Potter MAX series

Lydia Rose Bewley

as The Fat Lady in Harry Potter MAX series

Dylan Postl

as Filius Flitwick in Harry Potter and the Philosopher's Stone (HBO Max)

Heather Langenkamp

as Pomona Sprout in Harry Potter and the Philosopher's Stone (HBO Max)

Joseph Winford Warren

as Vernon Dursley in Harry Potter and the Philosopher's Stone (HBO Max)

Vanessa Kirby

as Petunia Dursley in Harry Potter and the Philosopher's Stone (HBO Max)

Melissa McBride

as Madam Hooch in Harry Potter and the Philosopher's Stone (HBO Max)

Mel Gibson

as Garrick Ollivander in Harry Potter and the Philosopher's Stone (HBO Max)

Isla Fisher

as Molly Weasley in Harry Potter and the Philosopher's Stone (HBO Max)

Jennifer Connelly

as Minerva McGonagall in Harry Potter and the Philosopher's Stone (HBO Max)

Jack Black

as Rubeus Hagrid in Harry Potter and the Philosopher's Stone (HBO Max)

Keanu Reeves

as Severus Snape in Harry Potter and the Philosopher's Stone (HBO Max)