Cindy is a very prideful, intelligent, arrogant, stubborn, tomboyish, and independent girl that lives in Retroville with Jimmy Neutron and his friends, and a temporary love interest for Timmy Turner, but is truly Jimmy's girlfriend.
Cindy is a 10 year old blonde-haired girl with green eyes. She wears a fading-green shirt with stripes and wears her hair in a pony tail. She also has tan pants and white shoes. In her debut, she wore a pink shirt with black jeans and pink sneakers and wore her hair in pigtails. She has blue eyes when in Timmy's universe and green eyes when in Jimmy's universe.
Cindy appears in all the Jimmy-Neutron-Fairly OddParents crossovers, and is seen in 2D for the first time (along with Sheen, Carl, and Libby in When Nerds Collide!. After The Jerkinators! and Jimmy Neutron being cancelled while FOP was revived in 2008 with the premiere or Fairly Odd Baby, Cindy and other Jimmy Neutron characters haven't appeared or been mentioned since then.