Suggestions by @dc_fan

Nick Robinson

as Iceman in Characters Not in the MCU

+3-2Score: +1

Dylan O'Brien

as Spider-Man in The Perfect Spider-Man movie

+13-3Score: +10

Anya Taylor-Joy

as Gwen Stacy in Candidates for the MCU's Gwen Stacy

+3-6Score: -3

Sydney Sweeney

as Black Cat in Candidates for the MCU's Black Cat

+7-9Score: -2

Jason Segel

as Ben Grimm in Fantastic Four

+3-4Score: -1