Suggestions by @bartrocket

Chris Hemsworth

as Obi-Wan Kenobi in Star Wars: The Phantom menace (2009)

Score: +1

Mark Hamill

as Riff Tannen in Back to the Future: The Game (90s)

Score: +1

Kevin Conroy

as Bruce Wayne in Justice League vs. Godzilla vs. Kong

Score: +2

Mara Wilson

as Sarah Anderson in Adventures in Babysitting (1997)

Score: +1

Joseph Mazzello

as Daryl Coopersmith in Adventures in Babysitting (1997)

Score: +1

Bradley Pierce

as Brad Anderson in Adventures in Babysitting (1997)

Score: +1

Chandler Riggs

as Marty McFly in Back to the Future (2015)

Score: +2

Alex Lawther

as Dave McFly in Back to the Future (2015-2020)

Score: 0

Chandler Riggs

as Marty McFly in Back to the Future (2015-2020)

Score: -1

Tobey Maguire

as Spider Man ( 1990s ) in Actors who could or could have played Spider Man

Score: +2

Anthony Daniels

as C-3PO in Star Wars: The Phantom menace (2009)

Score: +1

Dakota Goyo

as Young Anakin Skywalker in Star Wars: The Phantom menace (2009)

Score: +1

Anthony Hopkins

as Palpatine in Star Wars: The Phantom menace (2009)

Score: +1

Ian McDiarmid

as Palpatine in Star Wars: The Phantom menace (2009)

Score: +1

Nicholas Hammond

as George McFly (1995) in Back to The Future - [1995-2000]

Score: +2

Seth Green

as Dave McFly in Back to The Future - [1995-2000]

Score: +2

Robin Williams

as Doc Brown in Back to The Future - [1995-2000]

Score: +3

Edward Furlong

as Marty McFly (1995) in Back to The Future - [1995-2000]

Score: +3

Matthew Lillard

as Marshall Eriksen in How I met you Mother (1995-2004)

Score: +1

Paul Rudd

as Ted Mosby in How I met you Mother (1995-2004)

Score: +1