Tobirama Senju is a prominent character in the Naruto anime and manga series. He is the younger brother of Hashirama Senju and served as the Second Hokage of Konohagakure. Known for his pragmatic and strategic mind, Tobirama was instrumental in creating many foundational institutions and jutsu, including the establishment of the Chūnin Exams and the development of techniques like the Shadow Clone Jutsu and Edo Tensei. His leadership and innovations have had a lasting influence on the ninja world.