Laín Coubert is originally the name Carax gives to the devil in one of his novels. Later, it’s the alter ego he adopts after learning of Penélope’s death and beginning the quest to burn all his work. Although Daniel originally fears Coubert, once he realizes it’s actually Carax he admires and protects him. On the other hand, Nuria makes a sharp distinction between Julian Carax, with whom she fell in love, and Coubert, who is defined by hatred and capable of violence, such as his casual murder of Sanmartí. Like Zacarías, Coubert is a figure associated with the devil but neither wholly bad nor good. He’s also a disturbing reminder that one individual can be capable of both great brilliance and love and great violence and hatred.