 This article is about a villain in Tokusou Robo Janperson.
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Doctor Koga (ドクター甲賀 Dokutā Kōga?, 20), real name Masao Aoki (青木マサオ Aoki Masao?), is a geneticist who theorized people with ninja lineage carried a "ninja gene" that could be harnessed to turn an ordinary person into a full-fledged ninja. His efforts to extract the gene and create an army of ninjas were decried as inhumane, leading him to take his talents to the SS-N. Koga abducted ninja descendants and performed surgeries until he successfully found a candidate that possessed the gene. Janperson teamed up with the victim to destroy Koga's laboratory, rescue the abductees, and capture Koga himself.