Daniel Sempere is a fictional character from the novel series "The Cemetery of Forgotten Books" by Carlos Ruiz Zafón. He is introduced in the first book, "The Shadow of the Wind," where he discovers a mysterious book that leads him on a journey through post-war Barcelona. As a young boy, Daniel is passionate about literature and becomes deeply involved in the secrets surrounding the author Julian Carax. His character embodies themes of love, loss, and the power of books, making him a central figure in the exploration of memory and identity throughout the series.