What argument does the creature offer in support of his demand, why?

Part of the creature's rationale for demanding a companion is that it feels that this is owed to him.  In this discussion, the reader sees the pure greatness of Mary Shelley and the implications of her work.  In a move which predates Modernism, the created essentially puts the creator on trial.  The former never asked to be brought into the world.  This revelation is powerful and proves to be quite compelling in assessing the battle of ethical responsibility between the monster and Victor.  Part of what the creature demands is owed to him by Victor because he was brought into the world and then abandoned by the creator.  Once Victor saw the hideous nature of his creation, he fled and the monster had to develop consciousness and understanding entirely on his own.  He asks for a companion and then stresses to Victor that he will leave.  Victor does not accept the offer because of his ethical stance against creating another creature.  Yet, this does not absolve him from his responsibility towards his initial creation.  These are some of the arguments and their implications offered in the dialgue between both creator and created.   The symbolism featured is truly profound.