Suggestions by @cydonia

Inde Navarrette

as Anna Marie/Rogue in Casting the X-Men with MCU actors

Inde Navarrette

as Anna Marie in 8. X-MEN

Inde Navarrette

as Anna Marie in X Men

Leonardo Lima Carvalho

as Sunspot in X-MEN '97

Finn Wolfhard

as Nightcrawler in X-MEN '97

Larsen Thompson

as Madelyne Pryor in X-MEN '97

Alex Kruz

as Forge in X-MEN '97

Sophie Thatcher

as Rogue in X-MEN '97

Lucy Boynton

as Emma Frost in X-MEN '97

Ewan McGregor

as Prof. X in X-MEN '97

Ralph Fiennes

as Prof. X in X-MEN '97

Trevante Rhodes

as Bishop in X-MEN '97

Cameron Britton

as Beast in X-MEN '97

Diego Calva

as Morph in X-MEN '97

Justice Smith

as Morph in X-MEN '97

François Civil

as Gambit in X-MEN '97

Larsen Thompson

as Jean Grey in X-MEN '97

Corey Mylchreest

as Cyclops in X-MEN '97

Patrick Schwarzenegger

as Cyclops in X-MEN '97

Cosmo Jarvis

as Wolverine in X-MEN '97