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 minor The Worst Witch characters
Fenella Feverfew is an unseen character in the book series. She is mentioned several times in the fourth book "The Worst Witch All at Sea" where she transfers to Miss Pentangle's Academy and leaves behind her black cat Ebony (since they have owls at Miss Pentangle's Academy).