In the sequels to First Class I would like to see:

Polaris (a young orphaned mutant with control over magnetism who is taken in by Xavier, she develops a crush on Havok, is later revealed to be Magneto's daughter, she then leaves the X-Men to join the Brotherhood with her father, Havok contemplates joining her as they have fallen in love, but he ultimately chooses to remain with the X-Men)

Mr. Sinister (a shape-shifting mutant and insane geneticist, he was behind the scenes at the concentration camp when Magneto was young and mentored Sebastian Shaw in mutant supremacy, becomes Magneto's new adversary now that Xavier is in a wheelchair, a young Cyclops is revealed to be one of his experiments and is freed by Xavier and the X-Men, revealed to be Mystique's long lost father, she kills him with help from Magneto, this pushes her further away from Xavier while making her closer to Magneto)

Cannonball (a heroic young mutant who joins the X-Men after his powers manifest and eventually becomes their field leader)

Moonstar (a Native American mutant with illusion powers, is a skilled archer and fighter, becomes a prominent team leader)

Destiny (a blind mutant woman with precognitive powers, she joins Magneto's Brotherhood and mentors a young Mystique)

Sentinels (created by government scientists and controlled by Mr. Sinister, utilized to capture mutants for his experiments)

Toad (a young English punk with an amphibious physiology and martial arts skills, becomes a member of the Brotherhood)

Storm (a white-haired African girl with the ability to manipulate weather patterns, caught trying to pickpocket Professor X)

Cyclops (a young boy with immense power behind his ruby quartz shades, rescued from Mr. Sinister by Professor Xavier)

Omega Sentinel (a female cyborg and Mr. Sinister's bodyguard, freed by Xavier and Magneto, becomes loyal to Magneto)

1. Sunfire 
2. Polaris 
3. Scarlet Witch 
4. Quicksilver 
5. Thunderbird I 
6. Sauron 
7.Cannonball 
8. Sunspot 
9. Sentinels 
10. Dazzler

X-23
Cable
Domino
Bishop
Madrox
Fantomex  
Helion
Sinister
Warpath
Layla Miller

Doop 
Apocalypse 
Captain Britain 
Illyana Rasputine 
Masque 
Sinister 
Cable 
Stryfe 
X-man 
Selene

Magik 
Dazzler 
Forge 
Dust 
Warpath 
Lifeguard 
M 
Polaris 
Cannonball 
Moonstar 
 
....not to mention the numerous re-castings of characters already featured in the films. 

I think it would be really interesting to have one about all three Summers brothers

1. X-23

2. Psylocke - was apparently in X-Men: The Last Stand, but her name was never mentioned, so it doesn't count.

3. Mr. Sinister

4. Scarlet Witch

5. Quicksilver

6. Bishop

7. Destiny

8. Boom-Boom

9. Legion

10. Hellion

I'd also like to see many characters already seen on film retconned, but that's a whole different story.

I want to see a better Juggernaught. and a better Iceman.

but with new characters, I'd like to see Vulcan.

I was Fairly surprised to see Darwin in First class.

@GothamRed: Morph is awesome, I do love him. But in these films, the powers tend to be more... organic, if you will. And Morph is a little too animated. We also already have Raven, so the shapeshifter spot's been taken. Hahahaha.

Hollow/Penance

Apocalypse

Squirrel Girl

Jubilee

Arcade

Vulcan

Phalanx

Proteus

Domino

Shadow King

All the normal folks, but the main bad due being sinister, and then following on with apocalypse in the next movie, also sentinels, lots and lots of them :D

For me it has to be Cannonball he is my favorite character to bad he is on hiatus right now.

Scarlett Witch & Pietro

Vulcan

Apocalypse

Sinister

Jubilee

Amara

Boom Boom

Avalanche

Psylocke(Done right -_-)

Cable, Bishop, different Gambit, different Wolverine, Sinister, and the Marauders.

• Cable
• Deadpool
• Cannonball
• Dani Moonstar
• Warpath
• Fantomex
• Psylocke.

1) Meggan (even though she's techincally with EXCALIBUR)

2) Magik/Illyana Rasputin

3) Scarlet Witch

4) Mister Sinister

5) Madelyne Pryor

6) Elixir

7) Polaris

8) Vulcan

9) Northstar

10) Legion

I want new, better versions of:

Kitty

Rogue (I prefer her as a teacher)

Psylocke

Colossus

From villains, I want many to appear. If they make a trilogy about Apocalypse, the following should appear:

Mr. Sinister

Apocalypse

Horsemen

Dark Beast

From other villains, I want:

Brotherhood (Mags, Mystique, Mastermind, Toad, Scarlet Witch, Quicksilver), Sentinels (including Master Mold, Nimrods, Bastion), Hellfire Club (Black King and Emma Frost as leaders) or even Sublime as the manipulative guy who controls Trask and Magneto to go on war!

I am going with the above post.

• Apocalypse
• Sinister
• Psylocke
• Domino
• Sentinels

I would preffer the movies to respect a little more the comics.

For example, I think nightcrawler sucked on the second movie. Sucked so much they took him away in the third picture.

Still, I would like to see:

1. Mr. sinister
2. Cable.
3. Domino.
4. Longshot.
5. Fantomex.
6. Psylocke.
7. Stryfe.
8. Siryn (Banshee).
9. Bishop.
10. onslaught

Forge, Hank Pym, Peter Parker, Matthew Murdoch, Franklin Richards, The Hand, Longshot, Omega Red and Mesmero

Sure some of these arn't mutants but they'll tie the Marvel Universe together. Who wouldn't want to see The X-Men, Spider Man and The Avengers take on Dr Doom

if anything, Chamber. matter fact, he coulda taken Havok's spot in First Class

@ReVamp said:

• Cable
• Deadpool
• Cannonball
• Dani Moonstar
• Warpath
• Fantomex
• Psylocke.

great list. would like to see the most of em too:

• deadpool
• Cable
• Fantomex
• Psylocke
• Scarlet Witch
• Mr. Sinnester
• Warpath
• X-23
• Ide

I'd like to see them do an X-Men movie without any of the big stars of the franchise, like a take on the concept of New Mutants, for sure I'd like to see a movie adaptation of 1. Elixir 2. Hellion 3. Dust 4. Armor 5. Magik 6. Surge 7. the Cuckoos 8. M 9. Wolfsbane 10. Doug Ramsey and Warlock

I would love to see a movie focused on the Sentinels

#1 choice Chamber