Are Silhouette, Midnights Fire and the Folding Circle members considered mutants...or are their powers derived from magic because of their mothers being magic beings?
They seem akin to the MCU Quicksilver and the Scarlet Witch, where their abilities are derived/unlocked by eposure to a "magic" source: The Universal Wellspring.
https://comicvine.gamespot.com/silhouette/4005-2119/