Suggestions by @abstrakt

Sophia Lillis

as Hope Summers in X-Men: Messiah Complex

Josh Brolin

as Cable in X-Men: Messiah Complex

Anya Taylor-Joy

as Polaris in Uncanny X-Men

Fionn Whitehead

as Havok in Uncanny X-Men

Asa Butterfield

as Beast in Marvel Cinematic Universe

Asa Butterfield

as Beast in X-Men (MCU)

Asa Butterfield

as Beast in Marvel Cinematic Universe

Charlize Theron

as Mystique in X-Men: Second Genisis

Jason Isaacs

as Magneto in X-Men: Second Genisis

Luke Benward

as Beast in X-Men: Second Genisis

Lance Lim

as Angel in X-Men: Second Genisis

Ashton Sanders

as Iceman in X-Men: Second Genisis

Haley Lu Richardson

as Marvel Girl in X-Men: Second Genisis

Dacre Montgomery

as Cyclops in X-Men: Second Genisis

Giancarlo Esposito

as Professor X in X-Men: Second Genisis

The Duffer Brothers

as Director in X-Men: Second Genisis

Paul Walter Hauser

as Blob in X-Men: Second Genisis

Ivanna Sakhno

as Avalanche in X-Men: Second Genisis

Robert Sheehan

as Toad in X-Men: Second Genisis

Cameron Monaghan

as Pyro in X-Men: Second Genisis