One of my favorite monsters is the succubus. I haven't made it clear but my demon characters are mostly based around the idea of succubi. They are manipulative creatures that can transform to suit their needs (manipulation and let me use the word suaveness being one of my favorite elements of any creature of villain). On top of that the idea of a dark enchantress has the most potential to me as an artist to be creative. I find there is a sort of elegance and grace (which someone trying to seduce others may need to have) to demons and dark spirits at their work in fiction and the succubus embodies that.