Yaya Ceravieja
The wife of a retired wizard and a natural organiser, especially of things that don't really need organising. She (and no one else) pronounces her name "Ah-wij" (a possible reference to Hyacinth Bucket from the BBC series "Keeping Up Appearances"). She wears a great deal of "occult" jewellery that doesn't actually do anything. Granny Weatherwax dislikes Mrs. Earwig, claiming that she reduces witchcraft to "shoppin'". Mrs Earwig isn't actually bad, but is extremely snobbish and self-absorbed (which is later revealed to make her immune to an Elf's power of glamour), has very poor people skills, and tends to assume everyone would really agree with her if they weren't so stupid (so does Granny Weatherwax, of course, but at least she doesn't "blame" them for being stupid).