Soichi Ayukawa is Miyuki&#039;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 Harris on researching Ultimite.<br /> <br /> He was the founding creator of the Big Foots after years of studies of the Ultimite when he worked for Lunatic Corporations until he quit after the death of his son.<br /> <br /> (Source: Basquash Fandom Wiki, edited)<br /><br />