[quote=@Lucius Cypher]
I like it. I may be willing to join, assuming you'd let the players make up some lore for their own characters.

I was thinking a sort of "barbarian", though personally he's more like just a guy who just never lived in a city or town for long. He raises dogs for hunting and guarding, and has his family's battleaxe from back when they were "barbarians". He's technically a poacher and not really a citizen of the nearby city/nation/whatever cause he never pays his taxes, and because of that he's a vagrant. It helps since he knows about the creature hunting him down; a mind-controlling, shapeshifting demon. She (though technically genderless it often takes the form of a woman) is not just trying to kill him, but take his soul so she can turn his body into an undead thrall and increase her own power by consuming his soul. This demon is also technically his mother (And grandmother, and great-grandmother, etc), because the way she steals your soul is through sex. His past fathers failed to slay the demon before she got to them, and now it's my character's turn to try to end his curse or end up an minion to her as well.

Possible enemies include: Wild animals, guardsmen who don't like barbarians/vagrants, his own undead ancestors, his former tribesmen (The one who raised him but for reasons he left on bad terms), and of course the demon herself. All my guy has is his family's axe, his own dagger, a pack of dogs, and the will to live. And just about all of those things are much more fragile than they appear. 
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Yes, the plan was for players to create their own lore and flesh out the setting on their own if they chose to do so, but I would still be looking over everything and making sure that what people came up with was consistent with what was already laid down. Your ideas would work pretty well as is, though maybe limit it to just one animal companion rather than a whole pack. 

Just for ease of recognition, I was planning to work with known mythology/traditional fantasy creatures when it came to the Night--the Fair Folk, goblins and trolls, vampires and werewolves, things like that. If you'd like to make up other creatures of the Night I'm fine with it as long as it's fitting and fair. In the case you suggested, something like a succubus would probably work.

If I get more people interested, I can probably go ahead and work on some of the setting, so as to give people an idea of what they have as a base to build on. Character sheets too. As seen in the tags, I'd like a fairly large number of participants though.