I guess that could be, but if that is so, how come Sanctus didn't know Nero was a half-demon? Or he did, and merely hid it in attempt to lure Dante in?
Maybe be better for Kyrie to be killed by someone right in front of Nero and have a new love interest appear in his life rekindling that broken spirit. And for Kyrie to return as a ghost. Otherwise, a way to reincarnate Kyrie into someone else: like a news reporter who can handle herself but still be in love with Nero.
I really think making her like a female Constantine has the best potential
Makes her relevant and useful without being a fighter etc