Kylie Griffin (voiced by Tara Charendoff) was first introduced as one of the next generation of Ghostbusters in Extreme Ghostbusters.
She is appointed by the group to carry the ghost trap on her back. She becomes involved with the Ghostbusters after enrolling in Egon Spengler's course at City College of New York. Kylie shares certain traits with Egon, such as knowledge of the supernatural. Both are eccentric and socially awkward and they both had encounters with supernatural beings from their childhood (Egon met the Boogieman and Kylie's friend was taken by the Grundel). As part of Extreme Ghostbusters, Kylie is featured in the video games Extreme Ghostbusters for the Game Boy Color, Extreme Ghostbusters: Code Ecto-1 for Game Boy Advance and Extreme Ghostbusters: The Ultimate Invasion for the PlayStation. She was also the basis of several action figures from Trendmasters. Kylie is widely regarded as the fan favorite of Extreme Ghostbusters.
Kylie reappears as a supporting character in IDW Publishing's Ghostbusters comic. She first appears in issue 5 in 2012 as the manager of Ray Stantz's occult book shop. In November 2012, it was announced that Kylie would be made an official Ghostbuster in issues beginning in February 2013.