These are all casted from a reboot perpective. I will not be bringing back many actors we have already seen before, unless I can't think of anyone else.
HEROES:
First is Professor Charles Xavier. This is probably the hardest character I've ever had to cast. How can you replace Patrick Stewart? Nigh impossible, it is. But I think I've found the best actor to take on Professor X. He is an Oscar-winner, and multiple time Oscar-nominee. Here is Sir Ben Kingsley as Professor X!
Next is Scott Summers, AKA Cyclops. I had a bit of trouble casting Scott, but I think my final choice is a good one. It's not Josh Duhamel, despite his popularity, but he is not a good actor at all. This actor both looks the part, and can act. He's excellent at playing the nice guy who always tries to do the right thing, and he is more physically fit for the part, standing at around 6'4", and is ripped. His acting ability has grown a lot over the past couple of years, as shown on his show Supernatural, and I am not the only one with this opinion. Here is Jared Padalecki as Cyclops!
Emily Blunt as Jean Grey!
I am not even gonna try to cast Wolverine. I apologize, but I just can't.
Naomie Harris as Storm!
Bret Harrison as Iceman!
Dominic Monaghan as Nightcrawler!
Steve Bacic as Beast!
Eliza Dushku as Rogue!
Daniel Cudmore as Colossus! (Lack of a better choice)
Emmy Rossum as Shadowcat!
Garrett Hedlund as Warren Worthington III/Angel!
Mike Vogel as Havok!
Kevin McKidd as Banshee!
Kate Beckinsale as Psylocke!
Jimmy Smits as Forge!
Maggie Q as Jubilee!
Jonathan Rhys Meyers as Gambit!
Kevin Grevioux as Bishop!
Kurt Russel or Michael Biehn as Cable!
Michael Stahl-David as Cannonball!
Alex Johnson as Magma!
Rosario Dawson as Marrow!
Elisha Cuthbert as Emma Frost!
Ryan Reynolds as Deadpool! (Duh)
Paul Rudd or Jay Baruchel as Weasel!
Cloris Leachman as Blind Al!
Joe Lo Truglio as Bob, Agent of HYDRA!
Isla Fisher as Siryn!
Milla Jovovich as Domino!
Summer Glau as X-23!
VILLAINS:
Ed Harris as Magneto!
Rose McGowan as Mystique!
Andy Serkis as Toad!
Liev Schreiber as Sabretooth! (For lack of a better choice)
Christian Campbell as Quicksilver!
Anne Hathaway as Scarlet Witch!
Ethan Suplee as The Blob!
Michael Rosenbaum as Multiple Man!
Matt Long as Avalanche!
Seann William Scott as Pyro! (Couldn't think of anyone else)
Kevin Durand as Juggernaut!
Michael Clarke Duncan as Apocalypse! (Like you didn't expect it)
Keith David or Ian McShane as Mr.Sinister!
Rutger Hauer as Dr. Killebrew!
Laurence Fishburne as the voice of the Sentinals!
Whew! I think that does it for this fan cast. Please give your opinions in the comments. I hope your not too critical :) Thanks for reading.