Suggestions by @user_212973

Keanu Reeves

as Mr miracle in The Flash

Score: +1

Jessica Henwick

as Meloni Thawne in The Flash

Score: +1

Alexander Molony

as Bart Allen in The Flash

Score: 0

Jensen Ackles

as Batman in The Flash

Score: 0

Jai Courtney

as Captain Boomerang in The Flash

Score: +2

John Weasley Shipp

as The flash. in The Flash

Score: +1

Will Poulter

as Green Arrow in The Flash

Score: 0

John Boyega

as Cyborg in The Flash

Score: 0

David Corenswet

as Superman in The Flash

Score: +1

Khylin Rhambo

as Kid Flash in The Flash

Score: 0

Naomi Scott

as Iris west in The Flash

Score: 0

Anthony Starr

as The reverse flash/Professor Zoom in The Flash

Score: +1

Grant Gustin

as The Flash in The Flash

Score: 0