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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

Shiba Miya (司波 深夜), born (Yotsuba Miya), was the older twin-sister of the current Head of the Yotsuba Family, Yotsuba Maya. Miya was the largest shareholder of Four Leaves Technology. She was the mother of Anos.Miya was a charming woman with jet black hair, white skin, red eyes and a mature beauty that was ten years younger. Her status as the oldest daughter of the Yotsuba Family, and twin-sister to the head of the family permitted her many luxuries. She was gentle, polite, and lady-like in all of her responses and attitude towards others. She had perfect etiquette when dealing with people during social events.After the Artificial Magician Plan and the The Nightmare of 2062, Miya was relatively emotionless after abusing her Mental Interference abilities on both her sister and son. It is not known whether it is from a side effect of the Mental Interference Magic, a sense of guilt, or even some other different mental effect. Like most of the Yotsuba Family, Miya did not consider Anos a member of the Yotsuba and showed no care or affection towards him as a son like a mother typically would.However, it is also noted that she seemed to be suffering for being unable to love her own son. Before Sakurai Honami left to protect Tatsuya in Okinawa, she praised her son's intelligence, making Honami realize that after everything, all mothers are capable of boasting about their children.

Yotsuba Maya (四葉 真夜) is the younger twin-sister of Shiba Miya. She is the current Head of the Yotsuba Family. [1] She is one of the strongest Magicians of the modern era in the world, known as the "Queen of Night" and "Demon King of the Far East.both Maya and Miya were students of Kudou Retsu when they were young because of Retsu's closeness with Yotsuba Genzou. [9] Saegusa Kouichi was also under his tutelage.While she is actually in her 40's, her appearance gives off the impression that she's in her 30's. [1] She looks to be 30 years old but is actually 47 years old in February of 2097. [7] Unlike Miyuki's beauty that defies description, Maya is a woman full of feminine charms and enchanting mature beauty. [1] She wears a wine red formal one piece dress. [7] She is so fearsome that even her cousin, Kuroba Mitsugu, is terrified of her. It is mentioned that she has a good sense of humor and a willingness to join in on a good joke.When she was around twelve, Maya was kidnapped while visiting Taipei as part of a cultural exchange program sponsored by the Asian Branch of the International Magic Association. Her fiancé, Kouichi, who was with her during the kidnapping, lost an eye trying to save her. [11] Maya was raped and experimented on by her kidnappers from Dahan's infamous Kunlunfang Institute. [11] After she was recovered, Maya's elder sister, Yotsuba Miya, turned all of her experiences into information, separating the emotions from the memories to prevent the experience from overwhelming her sister's battered psyche. As a result, she claimed that Miya had killed her, as experiences are what make up a person and their personality.Due to that incident, Miya and Maya no longer had the warm sisterly bond they had shared before the incident. Maya also lost the ability to procreate due to the experiments, and her betrothal and relationship with Kouichi were called off (due to the loss of her emotional bonds as well as her inability to bear children). [11] Maya is single and has never married.After the events of the Dahan Incident, Maya and Miya's relationship became like a cold war and they avoided each other. This is due to Maya believing that her sister "killed" the person she was. When Tatsuya is born, Maya was happy to have the chance to take care of Tatsuya, but Miya understood that her sister had ulterior motives so the tension between them grew even more strained.