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 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.