Suggestions by @nihilisticat

Paula Patton

as Jakita Wagner in Planetary

Score: +1

Mark Harmon

as Elijah Snow in Planetary

Score: +2

Tim Curry

as Yevaud in Earthsea

Score: -1

Stan Lee

as Cameo in Monster Mash! (Dark Universe)

Score: 0

Robert Eggers

as Director in The Call of Cthulhu

Score: +11

Milana Vayntrub

as Janine Melnitz in The Real Ghostbusters

Score: +1

Tommy Wiseau

as Director in The Witcher

Score: -5

Gal Gadot

as Diana of Themyscira in Booster Gold and Blue Beetle

Score: +1

Ben Affleck

as Bruce Wayne in Booster Gold and Blue Beetle

Score: +1

Henry Cavill

as Kal-El, Clark Kent in Booster Gold and Blue Beetle

Score: +1

Gore Verbinski

as Director in The Anubis Gates

Score: +1

Johnny Depp

as Horrabin in The Anubis Gates

Score: 0

Armie Hammer

as William Ashbless in The Anubis Gates

Score: 0

Paul Giamatti

as Brendan Doyle in The Anubis Gates

Score: 0

James Gunn

as Director in Conker's Bad Fur Day

Score: +3

Zach Galifianakis

as Dionysus in Greek Myths

Score: -1

Michael J. Fox

as Marty McFly in The Perfect Back To The Future Movie

Score: +13

Barack Obama

as President Josh Clanton in Perfect Dark

Score: -3

Armie Hammer

as Mr. Blonde in Perfect Dark

Score: 0

Bill Hader

as Elvis in Perfect Dark

Score: +2