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".
Tilly Witch
Tilly Ipswitch is a witch and the Queen of Halloween. One night, she tries playing at being happy, reasoning that children use Halloween to play at being evil witches. Unfortunately for her, she is unable to stop being happy once she begins. Tilly Witch then goes out on a quest to cure herself of her happiness. She visits a witch doctor, who prescribes a refresher course at Miss Fitch's Finishing School for Witches, Tilly's old school. Miss Fitch is shocked to see her former best pupil so cheery. When Tilly adds sugar and chocolate to the witch's brew, the teacher makes her sit in the corner wearing a dunce's cap. Eventually the thought that children might stop being scared of her and so stop believing in Halloween so enrages Tilly that she returns to her old self. She celebrates her return to normalcy by scaring her own cat with a pumpkin mask.
Tilly Ipswitch first appears in Don Freeman's "Space Witch", originally published in 1959 and later as a Picture Puffin. In this book the Queen of Halloween takes Halloween to the stars.