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 current Witch to hold the title is a particularly powerful, evil and feared witch who hides her ancient age and disgusting ugly real looks behind an attractive disguise in order to blend in with society, and plots to wipe out all the children in England after summoning the local witches for this task. The child protagonist and his grandmother, a retired witch-hunter who once searched the world for the Grand High Witch encounter her by accident in a hotel in England, setting in motion the main plot of the novel.