Hansuke Doi is a character from the anime series Nintama Rantarou, which is set in a fictional ninja academy. Hansuke serves as a teacher and mentor to the young ninjas in training. Known for his calm demeanor and wisdom, he provides guidance and support to his students, helping them navigate the challenges of their education and training. Despite his strictness, he deeply cares for his students' well-being and development, often finding himself in humorous situations due to their antics. His role is crucial in shaping the young ninjas' skills and moral values.