| The subject of this article is non-canonical.|
While created as part of licensed material, it has not been confirmed as part of the "real" Buffyverse.
Cynthia was the false identity of a Chaos Demon, in a partnership with a vampire pack for to trap and drained young girls.
When Buffy Summers, Willow Rosenberg and Cordelia Chase organized a slumber party, their new friend Cynthia voluntered to coordinate it. Buffy's boyfriend, Angel uncovered Cynthia's true motive: she arranged the lavish slumber party for her vampire father (in reality, an associate) and his friends to crash and feast on.
Dusting all the vampires, Buffy faced down Cynthia, who revealed her true appearance: neither vampire nor mortal but actually lower demon from the Hellmouth. Before Cynthia could cause any real damage, the Hellmouth reclaimed its own and sucked Cynthia back. Angel later fought another chaos demon, whether this one had any famy ties to Cynthia has been unrevealed.