Cindy is an intelligent, prideful, and competitive girl that lives in Retroville with Jimmy Neutron and his friends, and a temporairily love interest for Timmy Turner, and but usually for Jimmy Neutron.
Cindy is a blonde-haired girl with a fading-green shirt, and wears her hair in a pony tail. She has blue eyes when in Timmy's universe and green eyes when in Jimmy's universe. She is also known to have a fiesty attitude, usually towards Neutron.
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 since then.