Seishiro Nagi's natural talent plays a significant role in shaping his development by giving him a head start in certain areas of his life. His innate abilities provide him with a strong foundation and advantage that can help him excel in specific skills or endeavors. Additionally, his natural talent may fuel his motivation and passion, leading to continuous growth and improvement in his chosen field. Overall, Seishiro Nagi's natural talent acts as a catalyst for his development, guiding him towards success and fulfillment.