Suggestions by @connorstern

Adolf Hitler

as Vittorio Abbate in Hey, i would give you a reminder, only this

Score: +2

Sylvester Stallone

as People who want RainbowWarrior to leave in Im back

Score: +1

Bill Cosby

as Rainbowwarrior in Im back

Score: +1

Harvey Weinstein

as Director in Im back

Score: +1

Gary Glitter

as Marcello Mastroianni in Something For My Sweet Honey

Score: 0

Sazh Katzroy

as Robert Smalls in Defiant

Score: -2

Bryan Dechart

as Connor in Detroit Become Human Recasting/Fancasting

Score: +15

Alan Rickman

as Severus Snape in The Marauders

Score: +70