Suggestions by @vincentwilliamsiii

Batman

as Bruce Wayne in Justice League I

Score: -1

Benedict Cumberbatch

as Lex Luthor in Superman I

Score: +1

Michael Fassbender

as Lex Luthor in Superman I

Score: +1

Darren Goldstein

as Lex Luthor in Superman I

Score: +1

Joseph Sikora

as Guy Gardner in Lantern Corps Series S2

Score: +1

John Boyega

as John Stewart in Lantern Corps Series S2

Score: -1

Matt Smith

as Jonathan Crane in Batman II (Batman & Robin)

Score: +1

Martin Freeman

as Kirk Langstrom in Batman II (Batman & Robin)

Score: +1

Jude Law

as Niles Caulder in Superman II (Superman/Batman)

Score: +1

Patrick Stewart

as Niles Caulder in Superman II (Superman/Batman)

Score: -1

Jack Nicholson

as Gillian Loeb in Batman I

Score: +1

Nicolas Cage

as Carmine Falcone in Batman I

Score: +1

Maggie Gyllenhaal

as Gilda Gold in Batman I

Score: +1

Joe Keery

as Guy Gardner in Justice League II

Score: -1

David Corenswet

as Kal-El/Clark Kent in Superman I

Score: -1

Joe Alwyn

as Michael Carter in Justice League II

Score: +1

Joel Kinnaman

as Cole Cash in Task Force X I

Score: +1

Matt Reeves

as Director in Flash II

Score: +1

Fred Hechinger

as Wally West in Flash II

Score: +1

Luke Evans

as Thaal Sinestro in Lantern Corps Series S2

Score: -1