The Want vs the Need: The Engine of Every Arc
The want is what your character chases. The need is what would actually save them. The whole story is the war between the two, and most writers only write the first.
Here is the most useful distinction in all of character writing, and it is so simple it sounds like nothing until you build a whole film on it. Your character has a want and a need, and they are not the same, and usually they are at war. The want is the thing they are chasing on the surface, the goal that drives the plot. The need is the deeper thing that would actually make them whole, the thing they cannot see because the want is standing in front of it. Most first scripts write the want beautifully and forget the need entirely, which is why they feel like a chase with nothing underneath.
Kurt Vonnegut gave writers the smallest, sharpest version of half this idea, and it is worth keeping close.
Every character should want something, even if it is only a glass of water.Kurt Vonnegut
He is right, and he is only talking about the want, the engine of scene-to-scene motion. What he leaves for you to add is the need underneath the water, the reason the thirst matters. A character who only wants is a plot. A character who wants one thing and needs another is a story.
The want drives the plot; the need drives the meaning
Separate the two jobs and everything gets clearer. The want is external, specific, and visible. Win the case, get the money, kill the man, reach the coast. It gives the audience something to track and gives the film forward motion. The need is internal and quiet. To forgive himself, to let someone in, to stop measuring his worth in the wrong currency. The want organises the scenes. The need is why we cry at the end.
Walter White wants to secure his family's future. That is the visible engine, and it pulls the plot through five seasons. What he needs, and never gets, is to feel that his ordinary life already mattered. The tragedy of Breaking Bad is that he chases the want so hard he strangles the need. He gets the empire and loses the only thing that would have saved him. That gap, want achieved, need destroyed, is where the whole meaning of the show lives. Take out the need and you have a crime procedural. Put it back and you have a tragedy.
The best endings pit them against each other
The most powerful climax in any script is the moment the character is forced to choose between the want and the need, because they cannot have both. This is the fork that reveals who they really are, which is exactly the pressure I described in how to write a character arc that feels earned. Michael Corleone wants to protect his family and needs to stay the decent man he was. The story keeps narrowing until he can have one or the other, and the choice he makes, protect the family by murdering his own humanity, is the entire film compressed into a decision. He gets the want. He loses the need. And we understand, in that final closing door, that the trade destroyed him.
Sometimes the character chooses the need over the want, and that is the shape of a hopeful film. Fern in Nomadland could grasp at the settled life on offer, the house, the family, the want a lonelier version of her might chase. What she needs is to keep faith with her grief and her freedom rather than bury them in someone else's spare room. She lets the easy want go. It is quiet, and it is a kind of victory, because she chose the deeper thing.
Give a character what they want and take away what they need, and you have written a tragedy without saying a word.
How to find the need under the want
Practically, you usually start with the want, because it is the loud one and it comes first. Then you dig. Ask why the character wants that thing, and then ask why again, and keep going until you hit something they would be embarrassed to admit, some old hunger underneath the goal. That buried thing is usually the need, or the wound that produced it. The revenge is really a cry to be seen. The money is really a plea to feel safe. The award is really a child still trying to be enough for a parent who is not watching. The want is the mask. The need is the face.
The teaching world circles this constantly. MasterClass, in its script writing guide, keeps motivation split between the surface goal and the deeper drive, and The Script Lab returns often to the idea that theme lives in the need, not the want. Which is exactly why the need is also where a film starts to think, the same territory I get into in cinema as philosophy. The want gives you a plot. The need gives you something to say.
Why this is really about empathy
You cannot find a character's true need from the outside. You have to feel your way in until you sense the thing they themselves cannot name, which is, once again, the skill I am convinced sits under all the others: empathy that cannot be faked. The want is easy to invent. The need has to be understood, the way you understand a friend better than they understand themselves. Get that, and your character stops being a set of goals and becomes a person quietly at war with themselves, which is the only war an audience ever truly cares about.