Suggestions by @spideyprowler

Tyrannosaurus Rex

as Z-Rex in Halfbrick Cinematic Universe

Score: +1

Rey Skywalker

as Marlene Mcfly in Back to the Future but Star Wars

Score: +1

Ben Skywalker

as Marty Mcfly Jr. in Back to the Future but Star Wars

Score: +1

Aaron Taylor-Johnson

as Elite Commando in Halfbrick Cinematic Universe

Score: +1

Count Dooku (Darth Tyranus)

as 3-D in Back to the Future but Star Wars

Score: +1

Darth Maul

as Match in Back to the Future but Star Wars

Score: +1

Emperor Sheev Palpatine (Darth Sidious)

as Burford Tannen "Mad Dog" in Back to the Future but Star Wars

Score: +2

Darth Plagueis

as Burford Tannen "Mad Dog" in Back to the Future but Star Wars

Score: +3

Darth Revan

as Burford Tannen "Mad Dog" in Back to the Future but Star Wars

Score: 0

Jobal Naberrie

as Stella Baines in Back to the Future but Star Wars

Score: +1

Jango Fett

as Biff Tannen in Back to the Future but Star Wars

Score: +1

Boba Fett

as Biff Tannen in Back to the Future but Star Wars

Score: +1

Darth Vader

as Biff Tannen in Back to the Future but Star Wars

Score: +1

Boba Fett

as Griff Tannen in Back to the Future but Star Wars

Score: +1

Kylo Ren

as Griff Tannen in Back to the Future but Star Wars

Score: +1

Darth Vader

as Biff Tannen in Back to the Future but Star Wars

Score: +1

Kylo Ren

as Griff Tannen in Back to the Future but Star Wars

Score: +1

Ben Solo (Kylo Ren)

as Griff Tannen in Back to the Future but Star Wars

Score: -1

Finn

as Goldie Wilson III in Back to the Future but Star Wars

Score: +1

Quarsh Panaka

as Goldie Wilson in Back to the Future but Star Wars

Score: +1