Suggestions by @rafaellain

Vin Diesel

as Mr. Poopybutthole in Rick and Morty

Score: +1

Hugh Laurie

as Rick Sanchez in Rick and Morty

Score: +1

Margaret Qualley

as Summer Smith in Rick and Morty

Score: +1

Margareth Qualley

as Summer Smith in Rick and Morty

Score: -1

Scarlett Johansson

as Beth Smith in Rick and Morty

Score: +1

Jaeden Martell

as Morty Smith in Rick and Morty

Score: +1

Michael Cera

as Jerry Smith in Rick and Morty

Score: +1

Ben Kingsley

as Albus Dumbledore in Harry Potter

Score: +1

Sean Pertwee

as Abeforth Dumbledore in Harry Potter

Score: +1

Linus Roache

as Abeforth Dumbledore in Harry Potter

Score: +1

Gary Oldman

as Albus Dumbledore in Harry Potter

Score: +1

Benedict Cumberbatch

as Lord Voldemort in Harry Potter

Score: 0

Martin Freeman

as Arthur Weasley in Harry Potter

Score: +1

Tilda Swinton

as Sybill Trelawney in Harry Potter

Score: -1

Ben Barnes

as Sirius Black in Harry Potter

Score: +2

Olivia Colman

as Dolores Umbridge in Harry Potter

Score: +1

Andrew Garfield

as Remus Lupin in Harry Potter

Score: +2

Stephen Fry

as Rubeus Hagrid in Harry Potter

Score: +1

Tom Felton

as Lucius Malfoy in Harry Potter

Score: +1

Tom Sturridge

as Severus Snape in Harry Potter

Score: +1