Professor Kozuki, also referred to as Dr. Kozuki, is a supporting character in the anime Neo-Human Casshern. He is a brilliant scientist and a friend of Dr. Kotaro Azuma, the researcher whose robot creations eventually turn against humanity. Kozuki is best known as the inventor of the MF Gun, a magnetic field weapon that uses electromagnetic force to destroy hostile robots without harming human beings. This invention becomes one of the few effective countermeasures available to the human side, and it is his daughter, Luna Kozuki, who carries the weapon into battle alongside Casshern. Until her father completes the MF Gun, Luna is described as entirely harmless, and the pistol he builds gives her a direct role in the resistance against Braiking Boss and his Android Army.

As Luna's father, Professor Kozuki is connected to the story's central human characters, and he supports the fight against the robot army from a scientific standpoint. His work reflects a motivation to defend humanity while avoiding needless destruction, since the MF Gun is designed specifically to neutralize machines while leaving people safe. His personality is conveyed mainly through his dedication as a researcher and his concern for his daughter, and his relationship with Dr. Azuma shows a professional friendship between two scientists whose separate work shapes the conflict. His bond with Luna gives his contributions a personal stake in the war. His notable ability is his scientific expertise, which produces a weapon of precise, selective force and provides the human resistance with a practical advantage against overwhelming mechanical opposition.