fellow which

this afternoon met my fellow witch -she drives a taxi in Ghent, not in

so better behave with her and may the forces of nature help you....

White witch -a witch or wizard whose supernatural powers are supposed to be exercised for good and beneficent purposes.

1A woman claiming or popularly believed to possess magical powers and practice sorcery.
A believer or follower of Wicca; a Wiccan.
2A hag.
3A woman considered to be spiteful or overbearing.
Informal. A woman or girl considered bewitching.
One particularly skilled or competent at one's craft: “A witch of a writer, [she] is capable of developing an intensity that verges on ferocity” (Peter S. Prescott).