Suggestions by @user_107872

Ewan Mitchell

as Barthy Crouch Junior in Harry Potter (story private)

Score: +1

Esmé Creed-Miles

as Bellatrix Lestrange in Harry Potter (story private)

Score: -1

Jeremy Irons

as The Sorting Hat in Harry Potter (story private)

Score: +1

Sacha Baron Cohen

as Nearly Headless Nick in Harry Potter (story private)

Score: +1

Tom Vaughan-Lawlor

as Borgin in Harry Potter (story private)

Score: +1

Adeel Akhtar

as Ted Tonks in Harry Potter (story private)

Score: +1

Ambika Mod

as Nymphadora Tonks in Harry Potter (story private)

Score: +1

Stephen Mangan

as Nearly Headless Nick in Harry Potter (story private)

Score: +1

Louis Shelton

as Ron Weasley (older) in Harry Potter (story private)

Score: +1

Owen Cooper

as Tom Marvolo Riddle in Harry Potter (story private)

Score: +1

Neil Edmond

as Hotel Manager in Harry Potter (story private)

Score: +1

Naomi Wirthner

as Madame Malkin in Harry Potter (story private)

Score: +1

Keira Knightley

as Madame Rosmerta in Harry Potter (story private)

Score: +1

Jeremy Swift

as Florian Fortescue in Harry Potter (story private)

Score: +1

Kit Harington

as Gilderoy Lockhart in Harry Potter (story private)

Score: +1

Mackenzie Crook

as Kreacher in Harry Potter (story private)

Score: +1

Alex Hassell

as Xenophilius Lovegood in Harry Potter (story private)

Score: +1

Matt Berry

as Sir Cadogan in Harry Potter (story private)

Score: +1

Paddy Considine

as Rufus Scrimgeour in Harry Potter (story private)

Score: -1

Rory Kinnear

as Amos Diggory in Harry Potter (story private)

Score: +1