I kept going down the rabbit hole:
What about Kumori?
Kumori is a character in the "The Dresden Files" series written by Jim Butcher. She is a member of the Hidden Reservation, a powerful organization of wizards and is a prominent figure in the later books of the series. Her role and significance in the story is part of the larger narrative and it would be best to read the series to understand her character and her involvement in the story.
What's her real identity?
Kumori's true identity is revealed in the later books of the "The Dresden Files" series written by Jim Butcher. I would not want to spoil the story for you, so I suggest reading the books to discover who she truly is and her role in the larger
Spoil me
Kumori's real identity is revealed to be Ivy, the daughter of Margaret LeFay and the half-sister of Harry Dresden in the "The Dresden Files" series by Jim Butcher.
Does anyone think it's possible ivy could actually be related to Dresden? Some of her past could be incorrect? Could her madness as The archive manifest itself as kumori? I doubt it, and I don't think the height or age makes sense at all. Still we could be dealing with time magic. It's so dumb but it's intriguing.
It also references the Hidden Reserve. Could this be what they call themselves? Fanfic? Lol
What if ivy spent her youngest years with the fey and aged more slowly?
I know ivys mom died by suicide and Harry's in childbirth. Still, we onow she really died by raithe or her own death curse consuming her life force. With Raithes gelding, someone could say she commited suicide to do it. Still it's laughably interesting... we don't know much about Margaret's mom. Could she have been the archive that died in the car accident? All we really have is that she was probably a vanilla mortal.
Also, imagine if Kincaid was the driver for Ebenezer's wife when she died in the car accident, if this was to be believed.