|Show||The Adventures of Jimmy Neutron: Boy Genius|
|First Appearance||"Jimmy Neutron: Boy Genius", December 21st, 2001|
|Friends||Jimmy, Libby, Sheen, Carl|
|Enemies||Beautiful Gorgeous, Professor Calamitous|
Cynthia "Cindy" Vortex is Jimmy's cute and beautiful girlfriend. She is considered one of the main characters and she helps her friends out on their adventures many times. Cindy is basically the hero-cute blonde role. She is a very smart, cute, beautiful, kind, prideful, intelligent, and independent character. She was shown with these personality traits throughout the series.
Cindy is a 9 year-old blonde-haired girl with green eyes. She wears a fading-green shirt with stripes and wears her hair in a pony tail. In her debut, she wore a pink short sleeved knee-length dress then a pink dress shirt with black jeans and pink sneakers and wore her hair in pigtails. She's very good at Tai-Chi. Her close friend is Libby. She has a dog named Humphrey. In the Jimmy Timmy Power Hour trilogy, Cindy has a relationship with Timmy Turner.
Cindy appears as a non-playable character in Nicktoons Unite!. She first appears in the lab of Jimmy when he and his friends come back from Fairy World. She gives him the fault of all the chaos in Retroville. She still seems to like Timmy as she is happy to see him again. She doesn't appear till the end of the game where Jimmy shouts to her to get out of his lab.
Nicktoons: Globs of DoomEdit
Cindy appears as a non-playable character in Nicktoons: Globs of Doom. When the heroes arrive at Retroville the Girl-Eating Plant takes Cindy away and probably also wants to eat her. However you encounter her again at the end of the second area of Retroville being trapped in the goo. It is possible that the plant simply left her there. She is stationed in front of the Candy Bar and has to be saved to continue. She keeps complaining to hurry up and manages to give a thank you, after you save her. She goes to Volcano Island afterwards.
- For unknown reasons Cindy's appearance in Nicktoons Unite! is the same as from the Jimmy Neutron film, while she already appeared in her current appearance in the series.