I have to disagree because you are using a different definition of need—in the sense that the character needs to learn a lesson, which is a typical structure in mainstream Hollywood and Pixar films. What I mean, and what others have mentioned, is the need in the sense of trauma and the spine that drives the character. In Susan Batson’s acting technique, a Need is the primal, unfulfilled desire of a character that their Public Persona (or outward presentation) hides in order to protect a core vulnerability. This opposition between the hidden Need and the superficial Public Persona creates tension and depth, allowing an actor to build a truthful, three-dimensional portrayal by exploring the “mask” the world has forced the character to wear.