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Kudou Makoto (九島 真言) is the head of the Kudou Family, which was one of the Ten Master Clans, and now is part of the 18 Assistant Houses. He is in charge of the Ninth Institute. He is the father of Kudou Minoru, who was born with his genetics from Makoto himself and from his sister, the wife of the head of the Fujibayashi Family.
Kudou Retsu blames himself for not stopping his son, Makoto from going too far in the pursuit of power, which created his son, Minoru. Retsu wants to end the purpose of turning magicians into living weapons.