Below are the lists of suggested, taken, and original characters here at MM. Italicized names indicate that a character is reserved.
The Cast List is also avaliable.
For the Morlocks canon list, please check the Morlocks information thread.

If you are interested in reserving a character, feel free to post that request below.

Suggested Canon Characters:
Angel - Warren Worthington III
Banshee
Beast
Belladonna - Bella Donna Boudreaux *An adoptable character.*
Black Queen - Selene Gallio *An adoptable character.*
Colossus - Piotr Rasputin
Copycat
Cyclops
Dazzler - Alison Blaire
Destiny
Dust
Feral - Maria Callasantos *An adoptable character.*
Firestar - Angelica Jones
Forge
Gambit - Remy LeBeau *An adoptable character.*
Husk
Jubilee
Juggernaut
Lifeguard
Longshot
Magik
Mastermind - Jason Wyngarde
Mimic - Calvin Rankin *An adoptable character.*
Meltdown (Boom Boom) - Tabitha Smith *An adoptable character.*
Multiple Man
Mystique - Raven Darkholme *An adoptable character.*
Nightcrawler - Kurt Wagner
Northstar
Penance - Yvette
Pete Wisdom
Polaris - Lorna Dane
Pyro - John Allerdyce *An adoptable character.*
Quicksilver - Pietro Maximoff *An adoptable character.*
Sabretooth
Scarlet Witch - Wanda Maximoff *An adoptable character.*
Sebastian Shaw
Shadowcat - Katherine "Kitty" Pryde *An adoptable character.*
Shatterstar - Benjamin Russell *An adoptable character.*
Siryn - Theresa Rourke Cassidy
Skin
Storm - Ororo Munroe *An adoptable character.*
Surge - Noriko Ashida *An adoptable character.*
Sunfire
Vivisector - Myles Alfred *An adoptable character.*
Warlock *An adoptable character.*
White Queen - Emma Frost *An adoptable character.*
Wolverine - Logan/James Howlett *An adoptable character; new application required.*
X-23 - Laura Kinney *An adoptable character.*

Taken Canon Characters
Avalanche - Lance Alvers
Berzerker - Ray Crisp
Binary - Carol Danvers
Blink - Clarice Ferguson
Cannonball - Samuel "Sam" Guthrie
Dead Girl (presently Moonbeam) - Nadia Ingram
Domino - Neena Thurman
Gaia
Healer
Hellion - Julian Keller
Icarus - Joshua "Jay" Guthrie
Iceman - Robert "Bobby" Drake
Jean Grey
Magma - Amara Aquilla
Magneto - Erik Lehnsherr
Professor X - Charles Xavier
Psylocke - Elizabeth Braddock
Rogue - Anna Marie D'Ancanto
Sage - Tessa
Sunspot - Roberto da Costa
Wicked - Allana Markus


Original Character List
Bast - Rhiannon Mathias
Chasm - Ira Sands
Darklight - Evangeline Petrovna
Grim - Dorian Buchere
Prodigy - Cho Yon Han
Psion - Paul Dawson
Rain - Liliha Cullen