In the scene where Darla is about to take Nemo from her uncle, Nemo plays dead, but Darla thinks he is just sleeping and starts shaking the bag. The last fish she received, Chuckles, was killed by her because she wouldn't stop shaking the bag Chuckles was in. Gill and the other fishes in Sherman's fish tank describe Darla as a fish killer and that Nemo is supposed to be her new pet fish. She is not antagonistic through evil or malicious intent but rather through rambunctiousness and the overexcitement of having pet fish, which ironically has frequently resulted in her killing them by accident. Darla is the niece of Philip Sherman, a dentist.
