But most of all we follow the Three-in-One, the Triple Goddess, who switch aspect between practically every panel. Each time we encounter them, they are wearing another guise.
They begin with the Moirai, Fates or Norns, the Ladies of destiny setting a life in motion, weaving/knitting its form, then cutting the thread to end it. We revisit Them in this aspect at the end, when it seems that They controlled the yarn throughout. But yarn is just another name for stories, and They are not its Prince.
Eventually They will become the seemingly inflexible Kindly Ones. Unable to stop within that function, the Erinyes relentlessly pursue Their prey. But does no-one think it strange that They - with such an ancient law to be fulfilled - waited until Lyta Hall turned up to set Them on Their path? It seems that even such a primal force, unleashed at the dawn of time, has choices.
The Furies chose to sit back spinning, stitching, severing, until They were called into play.
Or else taking some other aspect. We see them as Hope, Faith and Charity, on a tavern sign; or three old ladies telling tales to Rose Walker. Lyta Hall finds them as the Weird Sisters of legend, dropping dread items into a bubbling cauldron. Look for Them in the sub-plots and fine details, and the Three are everywhere!
Nor do They even have to be Three. At one point, the Kindly Ones pass over Eve, as that solitary lady is just another aspect of Them. Neither can it be forgotten that in classical legend, from which all of their divine vengeance names are borrowed, the Eumenides weren't a trio. They were many.