Suggestions by @michaelcasey

Andre Braugher

as Beast in The Fantastic Four

Score: +1

Charlie Heaton

as Red Hood in Every Batman Character

Score: -3

Eliza Dushku

as Catwoman in Every Batman Character

Score: -5

Tom Lenk

as Wesley Pryce in Buffy the Vampire Slayer (Reboot/Remake)

Score: -5

Sebastian Stan

as Batman in Dark Knight Trilogy (2013-2020)

Score: +1

Tom Hiddleston

as Wesley Wyndam Pryce in Buffy: The Vampire Slayer

Score: +2

Tom Hiddleston

as Spike in Buffy the Vampire Slayer (Reboot/Remake)

Score: -17

Harrison Ford

as Kup in The Transformers

Score: -2