Suggestions by @iskelaofthenight

Charlie Rowe

as Ted Tonks in The Marauders

Score: +2

Craig Roberts

as Rodolphus Lestrange in The Marauders

Score: +1

Jessica Brown Findlay

as Andromeda Black in The Marauders

Score: +1

Freya Mavor

as Molly Prewett in The Marauders

Score: +2

Daniel Kaluuya

as Kingsley Shacklebolt in The Marauders

Score: +2

Jessica Barden

as Alice Fortescue in The Marauders

Score: +1

Karen Gillan

as Lily Evans in The Marauders

Score: -10

Anya Taylor-Joy

as Petunia Evans in The Marauders

Score: +6

Bel Powley

as Narcissa Black in The Marauders

Score: +1

Saoirse Ronan

as Pandora Lovegood in The Marauders

Score: +3

Jamie Campbell Bower

as Xenophilius Lovegood in The Marauders

Score: +3

Arthur Darvill

as Arthur Weasley in The Marauders

Score: +1

Aneurin Barnard

as Severus Snape in The Marauders

Score: 0

Katie McGrath

as Bellatrix Black in The Marauders

Score: +9

Harry Lloyd

as Lucius Malfoy in The Marauders

Score: +3

Dane DeHaan

as Peter Pettigrew in The Marauders

Score: +7

Andrew Garfield

as Remus Lupin in The Marauders

Score: +10

Ben Barnes

as Sirius Black in The Marauders

Score: +24

Aaron Taylor-Johnson

as James Potter in The Marauders

Score: +11

Cate Blanchett

as Amelia Clarence in Stalking Jack The Ripper

Score: +1