Souichi Ayukawa
Miyuki's grandfather and a skilled technician from the moon. Haruka revealed that he was formerly a mechanics professor there, possibly of some renown. Recently it has been discovered that at one point in time he worked with Thousand and Yang on researching ultimate. He where the one who made the bigfoots after years of studies of the ultimate when he worked for lunatic corporations. After the death of his son when they studied a new way to develop the bigfoots he stopped his work as an engineer for lunatic corporations.