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
Cyril is the toad whom Ethel Hallow uses her stolen animal-speaking spell on. However, Cyril is actually on Mildred's side and, as soon as Drusilla Paddock hides Einstein in the hollow pine tree, hops off to Mildred's room to tell her what had happened to Einstein. When on the rescue mission to save Einstein, Mildred sets Cyril free outside the school gates. He is not seen again after that.