Suggestions by @sgghn

Maika Monroe

as Dinah Laurel Lance in Green arrow (dcu)

Score: +1

Jesse Plemons

as Oliver Queen in Green arrow (dcu)

Score: 0

Javier Bardem

as Galactus in If I had cast the fantastic four

Score: +2

David Krumholtz

as The thing in If I had cast the fantastic four

Score: +1

Elizabeth Lail

as Invisible woman in If I had cast the fantastic four

Score: +5

Rudy Pankow

as Human torch in If I had cast the fantastic four

Score: +3

Eddie Redmayne

as Mr fantastic in If I had cast the fantastic four

Score: +1

Willem Dafoe

as Joker in The dark knight returns

Score: +2

Sam Elliott

as Commissaire James Gordon in The dark knight returns

Score: +1

Nico Parker

as Carrie Kelley in The dark knight returns

Score: +1

Josh Brolin

as Batman in The dark knight returns

Score: +2

Steve Carell

as Mario in Actors that should joined those franchise

Score: +1

Keegan-Michael Key

as Mario in Actors that should joined those franchise

Score: +1

Scarlett Johansson

as Mario in Actors that should joined those franchise

Score: +1

Adam Driver

as Mario in Actors that should joined those franchise

Score: +1

Bob Odenkirk

as Mario in Actors that should joined those franchise

Score: +1

Luis Guzmán

as Mario in Actors that should joined those franchise

Score: +1

Anya Taylor-Joy

as House of the Dragon in Actors that should joined those franchise

Score: -2

Paul Giamatti

as House of the Dragon in Actors that should joined those franchise

Score: 0

Emma Corrin

as House of the Dragon in Actors that should joined those franchise

Score: 0