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Professor Taro Kosaka (高坂 太郎 教授, Kōsaka Tarō Kyōju, 1): He knew the nature of the Gigi Armlet and his nephew Masahiko become Daisuke's friend. He is murdered by the Spider Beastman.

Behind the scenes[]

Portrayal[]

Professor Kosaka was portrayed by Yoshiro Kitahara (北原 義郎, Kitahara Yoshirō).

Appearances[]

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