Key says that Dr. Mima brought her into this world, calling him her "Creator". Yet she also refers to him as her "Grandfather". He is a pioneer in robotics, but he couldn't develop a robot that would move from its own will until he met Tomiko (Key's grandmother) and her Geist in Mamio Valley... Their daughter Toyoko provides him with a liquid manifestation of her and her mother's supernatural powers, which he uses as "gasoline" for his dolls/robots. Toyoko didn't want the same fate for her daughter Tokiko, so Dr. Mima fulfilled his daughter's will of suppressing all supernatural powers in Tokiko by hiding all the extracted gel inside her. Unfortunately, this act also suppressed her human consciousness. Therefore, Key believed she's another robot of Dr. Mimas'.
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