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Wendy was introduced as a back-up feature as well as a companion for Casper in Casper the Friendly Ghost #20, May 1954. Soon, she was trialed in Harvey Hits, starting with #7. After a total of six appearances, she received her own title, Wendy the Good Little Witch, in 1960. Other ancillary titles featuring the pleasant young witch include Wendy Witch World (October 1961 to September 1974), and Casper and Wendy (September 1972 to November 1973). Another Wendy the Good Little Witch comic ran from April 1991 to August 1994, and a three-issue Wendy and the New Kids on the Block saw print in 1991.
In addition to Casper, the Wendy comics frequently feature Wendy's "aunties", Thelma, Velma and Zelma, with whom she shares a cottage in a haunted forest. The story "Remember When" recounts how Wendy was abandoned as a baby on their doorstep. The sisters tried to raise her to practice black magic, but Wendy consistently called on good spirits for white magic, frustrating her aunties. Unlike Wendy, her aunts have green wartish skin of the type associated with Halloween witches. One story states that the reason for this is because witches don't get enough sleep.
Like many of Harvey's stable, Wendy is a design variation on the prototype of Casper. So are Richie Rich, Gloria Glad, Little Dot and others. She has appeared in various other media including television and film.
Christina Ricci's character of Kat in Universal's Casper movie was originally named Wendy in the script, but to avoid having to purchase the rights to the Wendy character, the name was changed at the last minute. The film does, however, show several hints that the character was originally Wendy, such as the red hoodie Kat wears in the film during one scene that resembles Wendy's robe from the comics.