This is Raguel. Yes, as in Raguel the angel. He's a character in one of my many books that I'm trying to write. In the story, he's come down to Earth to kill demons that have been appearing across the globe. When he gets very angry, one of his true forms shows...This is one of them. Here, he's a conscious mist/fog being that can solidify himself into whatever he wants. He favors this form, and will add wings and extra additions whenever he needs to (like in battle he'll add extra long claws one second and then no limbs at all). Please bear in mind that I'm not saying that this is the true Raguel (if you believe in angels, I do), I am using artistic license to depict a story version of Raguel. I know that he's definitely not like this. :)
I also have an inked version that I have posted on my Tumblr.
Created this with Sakura pens, Prismacolour, Touch and Copic markers, Pentel RSVP ballpoint pen for extra shading, and a white gel pen for highlights.