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
Sybil Hallow is the bumbling but well-meaning younger sister of the vindictive and stuck-up Ethel Hallow. She is shown to be a lot kinder than Ethel, doing anything to impress Mildred and trying to make Mildred her friend, such as attempting to rescue Mildred's bats after they were mistakenly assumed to have been locked in a chest.