[@Nariata] I'll have something up today or tomorrow. The idea I want to use is an adaptation of the character I made for my first RP on this site (she hasn't fit anywhere since then).

What I want to do is (sometime after the dragon escapes and looses hell with it) my character is captured by a necromancor looking into ways to increase his own power. He experiments  on her with the intent to see if a human could utilize demonic powers. The result of these only sort of successful expirements ends with a demon being trapped in the under layer of my character's soul. The upside of which is that my character can utilize some of the demons abilities (with varying efficiency) but it comes at a cost. The demon while not in control of the body can exert some control over my character's psyche in the form of suggests and temptations. Only my character can hear the demons voice.

Does that sound like something that would work? I would of course elaborate more in the CS but just as a base concept is it viable?