There isn't much we know about him. What we do know is guesswork at best.

[ And she's closing her eyes and leaning against the wall just to gather the facts in her head. ]

He may be a god as he has the ability to name a shinki. We've only managed to interrogate one shinki about him... and they referred to him as Father.

[ A breath as she finally opens her eyes. ]

Apart from that, there's nothing else we know.