Ok. It took me awhile but I got your answer.
The reason why there is a question mark is because neither the characters in the show nor the audience who he is exactly. In the show, the most likely suspect is this detective mainly because he's never around when Gekkou Kamen shows up.
This is probably the number 1 most poplar show ever among Japanese children. This was like their Batman. It ran for 131 episode which I think is the most episodes ever in a Tokusatsu show. It definitely beats out Kamen Rider's 98 episodes and Himitsu Sentai Goranger's 84 episodes.
But just like Batman and Superman, kids liked Gekkou Kamen so much that they tried and copy his stunts. And just like in the U.S, kids got hurt. This cause parents to complain and it led to its cancellation in 1959.
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