The antagonist of this work. A self-proclaimed "four-and-a-half-tatami genius" who develops intelligent and groundbreaking devices one after another. However, he has personality problems and uses his abilities to do evil things. It seems that J.J. was once an assistant.

The so-called mad scientist and the antagonist of this work.
As you can see from his name, he is a "dark" and "insidious" bastard. He commits various crimes, but is stopped by J.J. in a good place, and promises to cry. In the anime version, the name "Nekura" is either a problem or "Dr. Otaku Hermitage".

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