These are the approved characters (from the approved thread):
Arachne/Spider-Woman played by Midori Sadi
Beast played by MasterOfMyFate
Black Bishop played by Tonberryshuffle
Blink played by Pumpkin Seeds
Chamber played by Tonberryshuffle
Colossus played by Darth Dredd
Construct played by Dirtythesnapper
Cronus played by Ryven
Cyclops played by Alias
Daredevil played by Keldia
Dazzler/Dazz played by Saphir
Deadpool played by Rave
Domino/Winter played by Pumpkin Seeds
Enigma played by London
Firestar played by Angel Fire
Forge/The Maker played by Kuroneko
Ghost played by RainyHigh
Hulkling played by Orange Marmalade
Husk played by King Serperior
Icewoman played by AribethAmkiir
Influx played by jilorbb
Iron Fist played by Rave
Juggernaut played by MasterOfMyFate
Komodo played by ViperFang
Longshot played by Strangefate
Lucifera/Divine Kaleidoscope played by SpiralSpider
Marrow/Bones played by Kuroneko
Mirage/Ignus Fatuus played by lockepick
Multiple Man played by lockepick
Mystique played by DarkAngel111
NeverMore played by RainbowRian
Nightcrawler played by Moraline
Nirvana/Lily played by Bloodied Porcelain
Phoenix played by Novak
Psyche played by Strangefate
Pulse played by Muse
Pyro played by Bloodied Porcelain
Q/Omega played by Orange Marmalade
Rampart played by jilorbb
Rogue played by SpiralSpider
Sabertooth played by Novak
Shade played by Lady Lunarius
Shadowcat played by Strangefate
She-Hulk/Shulkie played by Midori Sadi
Singularity/Moonboots played by Doomsday
Spider-man played by JamesSureWould
Sunfire played by A Japanese Dane
The Archivist played by Ryven
The Jade Spider/Kasumi played by SpiralSpider
Toad played by Worshipping Master
Twins played by Alias
UpLink played by Bloodied Porcelain
Ursa Major/Bol'saja Medvedica played by Rave
White King played by DarkAngel111
Wiccan played by Saphir
Wildcard played by Braioch
Wolfsbane played by Black Howling
Wolverine/Weapon X played by Kuroneko
x (Amber Loveheart) played by DinaFlower
x (Angel Capulet) played by DinaFlower
Doctor Doom - not possible
Magneto - NPC
Moon Knight - possible depending upon write-up
Not approved yet (working backwards through page 21 - I need a break now):
Alchemist claimed by Niki315
Azazel claimed by Tonberryshuffle
Bishop claimed by Lady Lunarius
Black Queen claimed by Moraline
Elixir claimed by Empyrean
Excalibur claimed by Batman4560
Flame claimed by TamaRose
Gambit claimed by Amelita
Havok claimed by Matttheman89
Iron Maiden claimed by yasarra
Mimic - abandoned? originally claimed by King Serperior
Misery claimed by DemonessOfDeathValley
Palette claimed by RubySlippers
Polaris claimed by loislanekent
Rictor claimed by loislanekent
Siryn claimed by Red Stella
Storm claimed by Amelita
Thor [Artificer] claimed by Worshipping Master
Venom claimed by Cthonig
War-Room claimed by Batman4560
x (Kale Ven) claimed by lemaunt702
x (Trevor Tesch) claimed by Cthonig
Amp claimed by ?
Cloak claimed by ?
Jade Spider claimed by ?
Jubilee claimed by ?
Northstar claimed by ?
Quicksilver claimed by ?
Raven claimed by ?
Warpath claimed by ?
Boom-Boom claimed by Rave but now would be a possible 4th char
Statuesque claimed by SpiralSpider but now would be a possible 4th char