Suggestions by @ericw7

Matt Smith

as Lord Voldemort in Harry Potter (Max Original Series) Fancast

Score: 0

Deep Roy

as Filius Flitwick in Harry Potter (Max Original Series) Fancast

Score: +1

Sacha Baron Cohen

as Nearly Headless Nick in Harry Potter (Max Original Series) Fancast

Score: -1

Robert Carlyle

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

Score: +1

Annabelle Wallis

as Narcissa Malfoy in Harry Potter (Max Original Series)

Score: +1

Will Keen

as Amycus Carrow in Harry Potter (Max Original Series)

Score: +1

Conan Stevens

as Greyback in Harry Potter (Max Original Series)

Score: +1

Samantha Morton

as Alecto Carrow in Harry Potter (Max Original Series)

Score: +1

Andrew Scott

as Xenophilius Lovegood in Harry Potter (Max Original Series)

Score: +1

Adewale Akinnuoye-Agbaje

as Corbyn Yaxley in Harry Potter (Max Original Series)

Score: +1

Liam Cunningham

as Aberforth Dumbledore in Harry Potter (Max Original Series)

Score: +1

John Hannah

as Muggle Prime Minister in Harry Potter (Max Original Series)

Score: +1

James D'Arcy

as Rufus Scrimgeour in Harry Potter (Max Original Series)

Score: +2

Stephen Fry

as Horace Slughorn in Harry Potter (Max Original Series)

Score: +1

David Oyelowo

as Kingsley Shacklebolt in Harry Potter (Max Original Series)

Score: +1

Stephen Fry

as Kingsley Shacklebolt in Harry Potter (Max Original Series)

Score: -2

Thomasin McKenzie

as Nymphadora Tonks in Harry Potter (Max Original Series)

Score: -1

Terry Notary

as Grawp in Harry Potter (Max Original Series)

Score: +1

Eva Green

as Bellatrix Lestrange in Harry Potter (Max Original Series)

Score: +1