It's be a necrophilia if he'l be announced as a romance.
I really wouldn't call it necrophilia unless he was actually possessing a dead body, which it doesn't seem like since it was never mentioned that he was rotting the way Justice was. Just because he's a spirit doesn't mean he's dead, more that he's just an entity from a different realm. What seems more likely to me is that he's either a spirit manifesting completely of his own power, or he's a sort of abomination much like Anders or Wynne only with the spirit in primary control.
Either way I'm kinda on the fence of if I'd even want him available for a romance. He's pretty emotionally immature, as a few people have mentioned before, which is why he brings out the maternal side in so many people, myself included. ^.^;;
I'll just be happy when I can ride the Bull 