I was thinking maybe KOS-MOS dropped into EF a long time ago in a stasis form.
Then someone use her tech to create the W-series.
(In the spirit of SRW, like Astranagun)

Maybe that was crossing the line.

I wonder could there be mid-game upgrades?
Change in costume and equipment, new guns, swords, awakenings and getting a soul..etc
PT upgrade items.