 The character is based on various nursery rhymes and fables with characters named Jack including "Little Jack Horner", "Jack and the Beanstalk", "Jack and Jill", Jack Be Nimble, Jack Frost, Jack O'Lantern, and Jack the Giant Killer and others.Jack is typically portrayed as a rather benign trickster, always looking for quick ways to make a buck.However, Jack also displays a complete disregard for human life or the feelings of those around him, traits most often seen in those with sociopathy.