Hiruzen Sarutobi is a significant character in the Naruto series, serving as the Third Hokage of Konohagakure. Renowned as 'The Professor' due to his extensive knowledge of jutsu, Hiruzen leads the village with wisdom and compassion. He acts as a mentor to many younger ninja, including Jiraiya, Tsunade, and Orochimaru. Hiruzen plays a crucial role in maintaining peace and stability in the village, and his leadership is tested during the early conflicts of the series.