I am Cain. I live in Ghost's head, my creator. I am a demon but I am also a voice in his head telling him what to do. He can see me as a hallucinations and have normal conversations. I tell him to do u unspeakable and unholy things. A dark passenger is a dark side of someone causing them to stow away their dark thoughts from everyone else, I am the psychopathic side of Ghost. I have been with him for years now, since he was a little boy.