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 The Worst Witch characters
In "A Bad Spell for the Worst Witch" Mildred is turned into a frog by Ethel Hallow where she discovers a frog-magician Algernon Rowan-Webb and manages to have him turned back into a human.