This is something I always wanted to do. A nice massive X-Men MCU casting thread. Some are actors fans cast who I agree with, some are who I’d prefer. Let’s start from the leader.
(Other bonus marvel characters included)

Giancarlo Esposito as Professor X
(Fan casted)

Now I’d like to continue with the main X-MEN.

Dacre Montgomery as Cyclops!

Madelaine Petsch as Jean Grey.

Yaya Dacosta as Storm.
Something I will always want.

They have to keep Nicholas Hoult as Beast he did amazing and has already aged up into the character.

Robert Sheehan as Nightcrawler.

Charlie Hunnam as Gambit.

Emily Kenney as Rogue.

Alba Baptista as Kitty Pryde.

Colton Haynes as Iceman.

Trevor Jackson as Spyke
I love to see this character in live action for the first time. Nobody else could play him.

Naomi Scott as the Amara Aquilla version of Magma.

Katrina Law as Psylocke

PLEASE I need this!

Taron Egerton as Wolverine.

(He’s even friends with Hugh Jackman) it would be the perfect passing of the torch.

Alexandra Daddario could play the next Emma Frost in the MCU.

Trevante Rhodes as Bishop.

Definitely needed. He didn’t get enough screen time in #DaysOfFuturePast and died just as fast as Darwin did in #FirstClass

Sonequa Martin-Green as Mystique.

She would kill this role as race swap is fine since the character is blue anyway.

Andrew Lincoln as Magneto.

Another one that is needed!

Ritu Arya as Dust.

In need of new characters for diversity. This one is the way to go.

Ludi Lin as Sunfire.

We’ve already seen Pyro & Sunspot. It’s time for a new flame thrower.

Anna Kendrick as Squirrel Girl
(Fan casted)

She would most likely go in Young Avengers or Secret Warriors.

Dichen Lachman as Echo
(for the #Hawkeye show.)

This is not an X-Men but just another person I would like to see in MCU.

And last but not least (Bonus character)

Christian Serratos as White Tiger. (Ava Ayala)