Just Forsaken is fine.

Kelly should be a Tauren because that form is intimidating but she is not. And what happen to the ogre? Zaeed should be an ogre

this seems a good premise hope that you update it soon! it seems very interesting!

Just so you know it, making the forsaken able to reproduce is stupid. THEY ARE UNDEAD, the thing about them is that they are the dead from various species that came alive. It would probably be mire interesting if they offered people the chance to be brought back as a forsaken (maybe even the mass effect species)

Not meaning to ruah but are you going to start the story

Both Shepards as Worgon Hunters
James Vega as Dwarf
Kasumi Goto as Worgan or Pandarin
Joker as Pandarin
Jacob Taylor as Draenei Paladin
Kaidan Alenko as Gnome
Both Ken & Gabby as Goblins
Zaeed Massani as a Orc Shaman with a totom called Jesse
Karin Chakwas as Night Elf
Charles Pressly as Night Elf
Greg Adams as Draenei

Here's my propositions;

-Kaidan Alenko/blood elf/mage.

-Ashley Williams/Human/Paladin(that's how I see it but if you prefer warrior).

Karin chakwas/Forsaken/Priest-doctor.

Jeff"Joker"Moreau/Gnome/Flight lieutnant.

Greg Adams/Human/Engineer

Charles Pressly/Draenei/Navigator

Jacob Taylor/Troll/chaman

Miranda Lawson/Blood elf- Naga(I'm hesitating between these two but I'd rather go with naga)/mage

Zaeed Massani/Worgen/Hunter

Kasumi Goto/Night elf/Rogue

Jack/orc/warlock

Kelly Chambers/Draenei/Yeoman

Gabriella "Gabby" Daniels/Goblin/Engineer

Kenneth Donnelly/Goblin/engineer

James Vega/orc/warrior.

Samantha Traynor/Draenei(important this one)/Comm specialist

Steve Cortez/Tauren/Pilot

Here my suggestions sorry but I don't have any ideas for Jane and John.

Jack is too aggressive to be anything but an orc...Gabriella Daniels a gnome and Kenneth Donelly a goblin(insane engineering debates :P). Vega as a tauren or a draenei(his dominant size was kinda his defining feature in the game), Joker a troll(he kinda already is a troll in ME), Miranda a blood elf mage or maybe a night elf druid(she was supposed to be genetically perfect and really the only truly beautiful races in WoW are the elves), and i know that u already picked priest for chakwas but mistweaver monk suits her better(she's kinda always calm...and she's british..monks,especially mistweaver ones drink tons of tea :P).If Shepard is a Paragon you could make him/her a Paladin, otherwise a DK for pure badassery or a shaman for elemental mayhem...

Kaiden/Human/Mage
Ashley/Human/Warrior
Karin/Night Elf/Priest-Doctor
Joker/Troll/Flight Lieutenant
Greg/Gnome/Engineer
Charles/Human/Navigator
Jacob/Tauren/Shaman
Miranda/Blood Elf/Mage
Zaeed/Orc/Warrior
Kasumi/Night Elf/Rogue
Jack/Forsaken Blood Elf/Warlock
Kelly/Human/Yeoman
Gabriella/Draenei/Engineer
Kenneth/Dwarf/Engineer
James/Orc/Warrior
Samantha/Worgan/Comm Specialist
Steve/Human/Pilot
Jane Shepard/Blood Elf/Warlock
John Shepard/Blood Elf human hybrid/Paladin

I'm not sold about this idea at all. I wasn't sold when Freedom Guard was writing this idea and now I'm even less convinced about it. At least in this way. Since if I recall corcetly he was planning to make BL main antagonists? So I will ask this. What's the point to write something like Warhammer 40k (Eldars/Humans/Orks/Blue Weeboo Comunsists/Deamons) but without this all grim darkness?

Kaiden Alenko/Night Elf/Frost Mage
Ashley Williams/Orc/Warrior
Karin Chakwas/Draenei/Priestess
Jeff "Joker" Moreau/Gnome/Flight Lieutenant
Greg Adams/Gnome/Engineer
Charles Pressly/Dwarf/Navigator
Jacob Taylor/Human/Paladin
Miranda Lawson/Blood Elf/Arcane Mage
Zaeed Massani/Worgen/Hunter
Kasumi Gato/Pandaran/Rogue
Jack/Orc/Warlock
Kelly Chambers/Human/Yeoman
Gabriella "Gabby" Daniels/Gnome/Engineer
Kenneth Donnelly/Gnome/Engineer
James Vega/Draenei/Paladin
Samantha Traynor/Blood Elf/Comm Specialist
Steve Cortez/Blood Elf/Pilot
John Shepard/?(Depends on his personality)/Shaman or Paladin

why not ogres

NECRONTYR PLEASE! also great idea

sweet idea, for the forsaken i like Necrontyr and as for government maybe confederacy, as for the rebel demons how about a cabal from the shadows that stops corruption or something like that, as for name how about Solomon's key

Just use Forsaken Confederacy. It's really simple.