|Full Name||Kudou Retsu|
|Voiced By||Motomu Kiyokawa (Anime)|
|Novel||Volume 3, Chapter 4|
|Anime||Episode 10, Nine Schools Competition III|
Kudou Retsu is a very important figure in the magical community. Due to his former ties to the military, he has many connections and relationships, and knows secrets that are considered highly confidential.
Kudou Retsu took an interest in Tatsuya after witnessing his accomplishments at the Nine Schools Competition, being one of the few magicians present who understood most, if not all, of Tatsuya's abilities including his status as an unregistered Strategic-Class Magician. He also expressed a desire to meet privately with Tatsuya. He knows about Tatsuya's connection to the Yotsuba clan and attempts to convince Major Kazama to give him up completely to the military, in order to considerably weaken the Yotsuba's fighting prowess.
Kudou 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.
They have a working relationship, although Kouichi has the upper hand in their dealings. They share a common goal in trying to reduce the Yotsuba Family's power.
Kudou Retsu has close relation with Minoru. Minoru is Retsu's motivation for stopping the use of Magicians as living weapons. According to Retsu, Minoru is one of the strongest Magicians of his generation, with few in the world matching him and Minoru also has high potential as a magic artificer. By mentioning the above, Retsu often praise Minoru to improve his morale, while Minoru was in sick bed due to his weak constitution.