A Parallel World Counterpart is a near-exact copy of a person living in a world parallel to their own. Each and every person has a counterpart in a parallel world. This person is extremely similar to their counterpart, both in appearance and personality. It is highly possible that if a person falls in love with another, their counterpart will fall in love with the other person's counterpart. This is backed by the fact that a person who is born will take their parent's genes, and to get the genes to make them a counterpart, they would need to have parents who were counterparts to their own counterpart's parents.