Suggestions by @shtorm

Hayden Christensen

as Captain Cold in The Flash Trilogy

+3-1Score: +2

Rebecca Rittenhouse

as Nora Allen in The Flash Trilogy

+5-2Score: +3

Emilia Clarke

as Caitlin Snow in The Flash Trilogy

+16-4Score: +12

Imogen Poots

as Iris West in The Flash Trilogy

+5-2Score: +3

Emma Stone

as Batwoman in MCU + DCEU: Future Troopers (2020 -3000)

+3-0Score: +3

Ana de Armas

as Catwoman in Batman: Gotham Crusade

+4-2Score: +2