The characters' relationships with shadows evolve in a symbolic way throughout the story. Initially, shadows may represent fear or mystery, but as the characters progress in their personal journeys, they start to understand and accept their own inner darkness or secrets. This evolution signifies a deeper level of self-acceptance, growth, and coming to terms with the complexities of human nature. As the characters embrace their shadows as a part of themselves, they demonstrate personal growth and an acceptance of their own flaws, leading to a more well-rounded and complete sense of self.