Shūichirō Ayatsuki

Shūichirō Ayatsuki was a scientist, alive before the Dark War.

Information
The father of Nine and Caelica, and later the father-in-law of Jubei and the grand-father of Kokonoe, Shūichirō Ayatsuki was a scientist working with Relius Clover before the emergence of the Black Beast, he died shortly after it's creation.