Demon Constantine, who prefers to simply be called John, is the manifestation of the original John Constantine's own demonic taint and the undesirable parts of his personality. He's not truly evil, but he doesn't have the empathy and kindness that normal John has and is even more morally skewed. Anti-social, violent, alcoholic, chain smoker. Looks and sounds exactly like John Constantine at his worst. Despite all this, he shares John's memories and relationships, having the same opinions