-Patrick Stewart or Ralph Fiennes as Professor X (but then exactly like we see him in MoM with the Animated Series-outift and -wheelchair).

-Tom Hardy as Wolverine (I know he also plays Venom but fanart I've seen of this is so cool that I want to see him as Wolverine).

-Zoë Kravitz as Storm (she was already in the old X-Men movies, the voice of MJ in Into The Spider-Verse and she was phenonimal as Selina Kyle in The Batman).

-Lily Collins as Rogue (I liked her in Emily In Paris when I also watched a bit when my mom was binging it on Netflix).

-Henry Cavill or Matt Smith as Gambit (I feel like both can be a fantastic Gambit, Henry just has to join the MCU sooner or later and Matt Smith deserves a second chance after the disaster Morbius).

-Michael Fassbender as Magneto (I don't know, I think he played this role fantastic in the Fox X-Men movies. Isn't too old so he can be the perfect father for Wanda and Pietro).

For the rest I have no idea, but I have something interesting I want to share with you guys. I tried to make a MCU intro for the X-Men. The first 30 seconds is planned to be the normal MCU intro with the Marvel Studios logo when you normally hear the Marvel Studios fanfare. But then for the rest of the 29 seconds is planned to be the intro of the Animated Series (this is more like an intro for X-Men '97). I made it in Bandlab, but you need an account there to listen to it.

https://www.bandlab.com/user21r947tt84ufh77y/my-take-on-the-mcu-x-men-intro-v2-9307350f?revId=d5df73dd-6d07-ed11-b47a-281878315d59