About the best, most developed character I have read with regard to the theme is Terry Pratchett's Granny Weatherwax. You may want to take in the Witches Trilogy, three of Pratchett's books featuring Granny, Nanny Ogg, and Magrat Garlick.
I just think that the antics that they get up to are hilarious. Granny is cool...I love her character....ecclectic witch and all that. Although I think Granny herself would scoff at the description!
