Bob on evil Bob.
“I know,” I said. “The thing I saw with the Grey Ghost must be the piece that you cut off.” “Right,” he said. “Got it in one.” “Your offspring, one might say.”
Butcher, Jim. Ghost Story (The Dresden Files, Book 13) (p. 196). Penguin Publishing Group. Kindle Edition.
I grunted. “How big?” Bob rolled his eyes. “Do you want me to tell you in archaic measurements or metric?” “Ballpark it.” “Um. A hundred years’ worth of knowledge, maybe?”
Butcher, Jim. Ghost Story (The Dresden Files, Book 13) (p. 196). Penguin Publishing Group. Kindle Edition.
And this is effectively how Bonea must have been made since she seems to have Lash's knowledge but not her personality. Lash took the hits on the parts that made her, who she was. Given that, one parent could be the Archive, since she is effectively a spirit of intellect, with some small part given to make Bob. My personal WAG is that Bonea will become the Archive since the Archive, as yet, has no origin story.
While looking this up I ran in some egregious foreshadowing, with Bob saying that anything can be true in the multiverse and that there is almost certainly a Harry out there with an eye patch and a goatee. And we can hope, a hat.