The Headmaster of Yamanouchi, Sensei is the traditional "wise old master" archetype. His name can be translated to English as both "Teacher" and Master, making the title redundant. He possesses a wide range of abilities, a product of his many years of training and experience. As a martial artist, he is quite powerful, regardless of his advanced years and small stature. He also seems to possess a wide range of spiritual abilities, such as astral projection and the ability to levitate. But despite these skills, Sensei seems to prefer not involving himself directly in conflicts unless he has to.