Kevin Shane writes...

You have stated that you made the Weird Sisters into a blend of three different mythical triplets: the Fates, the Furies, and the Graces. Furthermore, each one of the Weird Sisters focuses on a different one of these trios: silver-haired Luna represents Fate, golden-haired Phoebe Grace, and raven-haired Seline Vengeance. According to the commentary on GargWiki's "City of Stone-Part I" article, the shift in their characterization throughout the series is described by you as due to the shift in which Sister's influence is uppermost at the time.

What do you mean by this? Whose influence is supreme in which episodes?