Cynthia "Cindy" Aurora Vortex is one of the main characters of the Nickelodeon animated series The Adventures of Jimmy Neutron, Boy Genius. She is an intelligent, prideful, and competitive blonde girl who has a rivalry with Jimmy Neutron, whom she secretly harbors a crush on. She is best friends with Libby.
In "Nightmare in Retroville", she was Muffy the Vampire Annihilator (a parody of Buffy the Vampire Slayer) and she became a vampire when she became Carl's victim.