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".
List of minor The Worst Witch characters
In the TV series, to tell Agatha and Miss Cackle apart, Agatha was depicted as wearing large, round glasses that greatly magnify her eyes (similar to Professor Trelawney from Harry Potter and the Prisoner of Azkaban). In the TV series, Agatha was portrayed by Clare Coulter, the same actress who played Miss Cackle.