udou Retsu (九島 烈) is the former head of the Kudou Family, which was one of the Ten Master Clans.[1] Now it is part of 18 Assistant Houses.[2] He is one of the most important figures from the Ten Master Clans in the 21st century, and until twenty years before AD 2095, was acknowledged to be one of the strongest Magicians in the world. He is an elderly man, whose age is around 70 years old. Despite his old age, his sharp, hawk-eye like gazes and booming, clear voice contrasts his aged appearance. He is always seen wearing a formal black coat and tie with his hands held together at his back. Despite being over nine decades old, Elder Kudou's mind still retains his keen intellect displayed in his younger years. Being a man who speaks his mind freely, he believes that magic is a means, not the end goal of magicians, and that unrelentingly training to raise one's magical power was not enough to become a great magician.udou Retsu was once the teacher of both the Yotsuba twins, Maya and Miya. However, he currently feels threatened by the rise of the Yotsuba and works to reduce their power