Shūichirō Ayatsuki

Shūichirō Ayatsuki was a scientist, alive before the First War of Ars Magus.

Information
The father of Konoe and Celica, Shūichirō Ayatsuki was a scientist working with Relius Clover before the emergence of the Black Beast. According to BlazBlue: Phase 0, Shūichirō created Kushinada's Lynchpin, referring to it as, "the nail that will nail (the entrance to the Boundary) shut". He also made mention of a key, referring to it as if it were something to be raised and that the lynchpin was incomplete without it.

When Shūichirō first got to work with Relius, he referred to him as a genius. He had a hand in creating a special Prime Field Device requested by a man with green hair. According to Shūichirō's logs, the Original Unit was said to be recovered from the Alucard family. He personally saw Relius getting swallowed up by the Black Beast. He began to panic and decided that using the lynchpin was the best solution. However, the key was not there, it having slipped from his grasp. As he waited for his eventual death, the last two lines in his log were, "I can no longer do anything anymore. All I can do now is just wait for my life to end...".

Shūichirō somehow avoided being swallowed by the Black Beast, but died of extreme seithr infection. In his last moments, he gave a clue as to how the Kushinada's Lynchpin could stop the Black Beast and how Celica was the key to use it.