Mildred Hubble
Mildred Hubble is a major character in "The Worst Witch" children's book series by Jill Murphy. She is the protagonist in all the books. She is friends with Maud Spellbody and Enid Nightshade and has a strong rivalry with Ethel Hallow and Drusilla Paddock.
Grand High Witch
The Grand High Witch is described as the most powerful being in the world and is the only one linking the secret societies of demonic witches that exist in various countries, as they are not allowed to contact each other. The Grand High Witch's headquarters is a great castle in Norway, where she has a magic money-printing machine and lives with large retinue of special Assistant Witches, tyrannically ruling over all the witches anywhere and plotting ever more harm to children everywhere. The current Grand High Witch, who is unnamed in the book but is known as Eva Ernst (Miss Eva / Miss Ernst) in the film, is described as "the most evil and appalling woman in the world."