Wendy's Aunts are known as (Gert, Gabby and Fanny) are three witches who were always using their magic powers to do wicked things unlike their niece Wendy the Good Little Witch who is the female/witch equivalent to Casper. In the Wendy comics, her aunts are named Thelma, Velma and Zelma, who are three ugly old hags with green skin and warts on their face, unlike in the 1998 direct-to-video film Casper Meets Wendy, where her aunts look normal except when they are wearing their witch's gown.

In Casper Meets Wendy, Desmond Spellman, an evil warlock tries to destroy Wendy and her aunts after hearing Wendy is a more greater witch. Wendy and her aunts had to try to stop using magic so they wouldn't get caught.

The lead witch, Gert is portrayed by Cathy Moriarty who also appeared in the 1995 feature film, Casper, as the film's antagonist: Carrigan Crittenden.

In the comics, Wendy Witch World, and Casper Meets Wendy, Wendy and her aunts lived in a cottage in a haunted forest, where most stereotypical witches would be thought to live in.

Gert has yellow magic, Gabby has blue magic and Fanny has orange magic.