Cecilia Nuthatch is the tritagonist and love interest of Louie from the 1993 animated film, We're Back! A Dinosaur's Story. She is student at Lindbergh Elementary School for girls.
She is voiced by Yeardley Smith (who is best known for the voice of Lisa Simpson from The Simpsons).
She has orange hair in a blue bow, a white dress with blue tie, rims, blue earrings, white socks, and blue shoes.
She first met Louie while Louie is running away from home. She cries and tells him about her parents' work and ignorance.
He convinces her to run away from home which she agrees to and introduces her to the dinosaurs, including Rex.
Louie begins to become attracted to Cecilia and have romantic feelings for her after he asks, "What are you, some kind of a debutante?" and Cecilia also becomes attracted to Louie and has feelings for him, saying, "Why, yes. As a matter of fact, I am." Louie allows the dinosaurs to be disguised as floats at a Thanksgiving Day Parade.
After the dinosaurs cause havoc in New York, she and Louie head to Central Park where the evil Professor Screweyes is running his own circus and meets the dinosaurs and made them the perfect addition for his circus.
He shows his "Brain Drain" pills to the two and allowing the children to devolve into monkeys. Rex and the other dinosaurs revert back into their wild selves by using the effects of the Brain Drain pills, but not before Rex reverts the children back into human beings by asking them to remember him.
She and Louie manage to sneak in the show and save the dinosaurs. After Rex is released and Rex tries to attack Screweyes, Louie tells him not to do it due to making it worse as Rex listens to Louie. But then Rex and the others return to normal as Louie and Cecilia hug them.
Captain Neweyes arrives in his aircraft as Cecilia, Louie and the dinosaurs leave the circus in Captain Neweyes' aircraft after Louie and Cecilia decide to kiss in public as Screweyes gets eaten up by crows.
Towards the end of the film, the dinosaurs begin to spend the day in the Museum of Natural History as Cecilia and Louie reconcile with their respective parents as they become a couple.