Rex Walls is a central character in the memoir "The Glass Castle," written by his daughter, Jeannette Walls. He is portrayed as an intelligent and charismatic man, often charming those around him with his storytelling and adventurous spirit. However, he struggles with alcoholism, which significantly impacts his family life and relationships. Despite his flaws, Rex is depicted as a loving father who encourages creativity and independence in his children. He often takes them on unconventional adventures, fostering a sense of exploration. His complex personality reflects the challenges of balancing dreams and reality within the context of a troubled family dynamic.