@ Wazzz
You could probably add a faceless one and give it a name like Cthulhu if you're looking for more ideas.
I've always found specific names for demons are more interesting than just the generic, all purpose names for them. Maybe call the archdemon a Balrog or Balor. A few minutes on Wiki with a demonology search could afford a lot of interesting names. You could also try Dungeons and Dragons demon, devil, and fiend searches - which probably have a nifty supply of ability ideas with them.
As for the split function abilities, that sounds like a cool route to go. I remember one of the heroes in League of legends had something similar, were if the caster has more health than the target the ability does bonus damage , if the caster has less the ability stuns them.
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@ Beef_Is_Back
Seems like a unique take on humans. If you stick to humans I'd recommend importing new units or utilizing campaign units to separate them from the alliance. I think Mr. Bob created a ton of human buildings, so that shouldn't be much of a problem. I think the city house doodads actually have build and death animations to.
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@ Sage Chow
Wow, those buildings offer a really solid aesthetic to a race. Not sure if all of Red Shift's units can combine together for the same feel, the shaman, savage, and centaur really don't seem to steam-pounikish. The cannon tower seems more observatory/scout towerish with the window at the end of the cannon to.
Really like how the graveyard and crypt look with different skins.
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@ Dionesiist
With all the resources you've submitted at this site it would be cool to see more of your own resources in a race, atm the grunt with wings looks a little odd. For naming conventions using distinct demon names could be cool as well, sort of the same thing with Wazzz
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@ Crazed_seal2
Overall seems like a good start. I wouldn't recommend giving a food supply any damage capabilities though, especially if it has mobility.
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@ ashbringer753
You really like fog effects don't you? A little hard to see what's going on there, but do I see some of the skins I've made

?
Anyways, it looks relatively distinct from the alliance which is good for a human race.
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@ Fan
You might want to use the standard Black Dragon Roost, atm the dragon roost you have seems a little plain in it's achromatic state. Other than that the female dragonspawn looks pretty good.