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.
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.