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 2017 TV series, Algernon Rowan-Webb is portrayed by Philip Martin Brown, debuting as a frog in the pilot episode, where he indirectly helps Mildred recreate a levitation spell to warn the other students about Agatha Cackle's attempted coup of the school. His status as a human is exposed in the fifth episode "Pond Life", which reveals that he was actually the first wizard to teach at Cackle's, and had a romantic relationship with Miss Bat, but was turned into a frog by spell science teacher Miss Gullet so that she could take the job herself. Once returned to human form, he becomes the spell science teacher himself, although he retains an elongated tongue for use in catching flies.