Suggestions by @marcozironi1

Millie Bobby Brown

as Firestar in MCU X-Men

+1-1Score: 0

Madeleine McGraw

as Valeria Richards in Every character from Fantastic Four

+1-0Score: +1

Zac Efron

as Gabriel Summers in Marvel Cinematic Universe

+1-0Score: +1

Sadie Sink

as Hope Summers in MCU XMEN fancast

+1-0Score: +1

Nick Robinson

as Iceman in MCU X-Men fan cast

+2-0Score: +2