Suggestions by @george_warner

Sean Pertwee

as Edwin Jarvis in Iron Man

Score: +1

Margaret Qualley

as Pepper Potts in Iron Man

Score: +1

Nicholas Hamilton

as Oliver Queen in Smallville (2021 - 2031)

Score: +1

Vincent D'Onofrio

as Trigon in Teen Titans (2000s)

Score: +3

Judah Lewis

as Whitney Fordman in Smallville (2021-2031)

Score: +1

Jesse Plemons

as Actors in actors & actresses who should be in Knives Out 4

Score: +2

Julian Sands

as Smallville in Deceased Actors by Franchise

Score: +1

Jerry Seinfeld

as Jeff in Who Looks Like My Parents (and their Plotagon clones)

Score: +2

Dylan Minnette

as Lex Luthor in Smallville (2021 - 2031)

Score: +1

Emily Blunt

as Tess Mercer in Smallville (2001-2011)

Score: +2

Topher Grace

as Davis Bloome in Smallville (2001-2011)

Score: +2

Jace Norman

as Jason Teague in Smallville (2021-2031)

Score: +3

Michael Rosenbaum

as Tenth Doctor in What If Doctor Who Was American?

Score: 0

Jamie Flatters

as Tyler Ledford in The Menu [2032]

Score: +1

Asher Angel

as Arthur Curry in Smallville (2021-2031)

Score: +2

Judah Lewis

as Patrick Wertz in Eternal Sunshine of the Spotless Mind (2024)

Score: +1

Sophia Lillis

as Lois Lane in Smallville (2021-2031)

Score: +2

Wolfgang Novogratz

as Doomsday in Smallville (2021-2031)

Score: +1

Cameron Monaghan

as Michael Rosenbaum in Lex Luthor 2001-2006 Counterparts: [Almost Cast]

Score: +2

Kelly Reilly

as Aunt May, in Spider-Man Movies (2012-2031)

Score: +1