Chief Researcher Gengorō Nagase serves as an engineer at Kurusugawa Electronics and is the technical lead within its robot development department. His primary responsibility is the creation and development of the androids Multi and Serio, along with various other robots in the series.

His appearance in the original series is brief and lacks exposition regarding his name or narrative function. The sequel expands his role, making him more central to the plot. He is sometimes treated rudely by the male lead, who blames him for problems beyond his control. Nevertheless, he aids the protagonist in discovering his future path and eventually becomes his mentor.

No personal background, age, or physical description is provided.