Every single time I sit down to write a new story, I remind myself that characters drive the story. Therefore, they drive the plot.
Following that logic, the plot of a story—any story for that matter—is not primary. Characters are not secondary.
It’s the other way around. Characters are primary; plot is secondary.
This is my approach when writing stories:
I come up with a character first. Or characters.
The plot, the problem, the conflict, everything else comes after.