I think he does have a special purpose, with all the things he's been gone through and the fact that he and Belldandy not only are together now, but also knew eachother as children. Yet I don't think that he's some kind of God, it would be rather strange that a possible God, who'd be able to do so much good as his heart is as gentle and kind as Belldandy's, would be stripped of his powers and memories, for that matter.
13-Dec-2004