| Enkhidu |
This is one of those entries that makes me smile, because its pretty much what I was planning on submitting had I gotten past the first round.
Try this for a Hetty twist: Hetty is actually a hag, and this has been her MO for decades (though the frequency is far less). Her oldest? They are now powerful merchants, politicians, and adventurers in their own right, and are loyal to a fault. "Grandmummy," is never far from their thoughts, and more often than not they do her bidding (knowingly or unknowingly). Presto! You get a seemingly innocuous woman protected by her community, with a horde of however-powerful-the-DM-decides NPCs at her beck and call. The fact that the threat level grows with the PCs level makes Hetty a viable long-term villain.