Suggestions by @druidmaster

Dennis Quaid

as Colonel William Stryker in MCU X-Men

Ciara Hanna

as Polaris in MCU X-Men

Michael Sheen

as Sebastian Shaw in MCU X-Men

Arnold Vosloo

as Apocalypse in MCU X-Men

Gerard Butler

as Sabretooth in MCU X-Men

Michael Gladis

as Beast in MCU X-Men

Ralph Fiennes

as Magneto in MCU X-Men

Michael Sheen

as Sebastian Shaw in X-Men

Gerard Butler

as Sabretooth in X-Men

Ciara Hanna

as Polaris in X-Men

Skeet Ulrich

as Mister Sinister in X-Men

Ralph Fiennes

as Magneto in X-Men

Natasha Liu Bordizzo

as Psylocke in X-Men

Natasha Liu Bordizzo

as Elizabeth Braddock in X-MEN MCU

Program (Tron)

as Live-Action in Christina Masterson

Natasha Liu Bordizzo

as Daniel Radcliffe in Actors (18+) who should play love interests of other actors

Natasha Liu Bordizzo

as Daniel Radcliffe in Romantic Pairings

Ivanna Sakhno

as Daniel Radcliffe in Actors (18+) who should play love interests of other actors

Ivanna Sakhno

as Daniel Radcliffe in Romantic Pairings

Scout Taylor-Compton

as Universal Monsters in Actors who should join certain big franchises