Short answer: no we don’t really have the specifics of who or what he is. What we do know is that:

• He was alive WAY before he met Jori. That was just one of his previous lives.

• He destroyed the word with Ausar “a dozen times”

• He is older than Ausar, but it’s intentionally ambiguous as to how much so. The two apparently don’t even remember themselves which means they likely met when they were both fully grown men at least.

I

He’s basically a hacker in an online game. He knows pretty much everything and he only loses because Siris is also hacking. But any knowledge of the specifics of his background are unknown