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A fun thread, and some of my questions answered.
Looks like (in this 'mode' at least) mirror-ed NPCs are 'locked' by the canon that transormed them rather than being beaten into hybrids, else Scarlett and/or Skies would've ended up more BB'W'. And transformed NPCs can spread the fun! At the moment, there doesn't seem to be any further exaggeration/degradation from the 'original', just a different costume, but once you're six steps away from the original Poison/Juri who knows.