The Worst Witch
Mildred "Millie" Hubble is the protagonist of the series. She is a good-hearted, but bungling young witch-in-training, who never seems to get anything right. She is friends with Maud Spellbody and Enid Nightshade and has a strong rivalry with Ethel Hallow. It is Miss Hardbroom, her potions teacher, who calls her "The Worst Witch".
Wyrd Sisters
"Wyrd Sisters" features three witches: Granny Weatherwax; Nanny Ogg, matriarch of a large tribe of Oggs and owner of the most evil cat in the world; and Magrat Garlick, the junior witch, who firmly believes in occult jewelry, covens, and bubbling cauldrons, much to the annoyance of the other two.