The characters' interactions with shadows evolve throughout the story as they begin to understand that the shadows are not just a physical presence but also represent deeper internal struggles and fears. Initially, the characters may try to avoid or ignore the shadows, but as the story progresses, they start to confront them head-on, leading to personal growth and self-discovery. The shadows become symbolic of the characters' inner demons, and by facing them, the characters are able to overcome their fears and gain a sense of empowerment.