I've been leaning towards the Western style as well. Personally, for my demons and angels, I've always enjoyed the idea that their full potential can't be reached in the human world. It's connected to their true body, in Hell or in Heaven. So, a demon is born a monstrosity, but to fit in, he crafts a body to use in the human world. At the expense of his true strength, he blends in. So, really, the monstrous body won't come into play, most likely. Or, if it does, I can tone back how it looks a little bit. He'd mostly stay with the first two during the RP.
Hell, not even ssure if his back story is cemented in yet. He may not even have that form. xD