Suggestions by @spyderpoison

Patrick Schwarzenegger

as Wally West/Kid Flash in DC Cinematic Universe Fancasting

Score: +1

Charlie Hunnam

as Oliver Queen/Green Arrow in DC Cinematic Universe Fancasting

Score: +3

Teresa Palmer

as Black Canary in DC Cinematic Universe Fancasting

Score: +1

Isabelle Fuhrman

as Raven in DC Cinematic Universe Fancasting

Score: +1

Jim Carrey

as Trickster in DC Cinematic Universe Fancasting

Score: +2

Doug Jones

as Martian Manhunter in DC Cinematic Universe Fancasting

Score: +2

Dakota Fanning

as Fire in DC Cinematic Universe Fancasting

Score: +1

Elle Fanning

as Ice in DC Cinematic Universe Fancasting

Score: +1

KJ Apa

as Jimmy Olsen in DC Cinematic Universe Fancasting

Score: +2

Mark Wahlberg

as Oliver Queen/Green Arrow in DC Cinematic Universe Fancasting

Score: +1

Justin Hartley

as Arthur Curry/Aquaman in DC Cinematic Universe Fancasting

Score: +2

Alexandra Daddario

as Ilmare in The Silmarillion

Score: +1

Idris Elba

as Namo/Mandos in The Silmarillion

Score: +1

Andrew Garfield

as Brandir in The Silmarillion

Score: +1

Elle Fanning

as Idril in The Silmarillion

Score: 0

Lily James

as Finduilas in The Silmarillion

Score: +1

Chris Hemsworth

as Huor in The Silmarillion

Score: +1

Keanu Reeves

as Hurin in The Silmarillion

Score: +1

Steven R. McQueen

as Dick Grayson/Robin/Nightwing in DC Cinematic Universe Fancasting

Score: +1

Josh Hutcherson

as Tim Drake/Robin III/Red Robin in DC Cinematic Universe Fancasting

Score: +1