Leslie’s static nature is exactly what makes her a hero in a sense. She exists in order to move the lives of others. She lives in order to make the characters around her grow. In that sense, she’s not the hero of the piece, but rather the hero maker. By virtue of being the rock that doesn’t move, she forces others to move around her, thus on a story level, forcing every other character to have a character arc as they move around her. As a character, she turns ordinary people into heroes.
In a certain way, stories have it backwards from the real world. We focus in on heroes as being the ones who evolve to something better over the course of a story. But in reality, we all change and evolve over time, even if only by flowing around the obstacles in our way, no better and no worse. But the heroes of the real world aren’t necessarily the ones who changes themselves, they’re the ones who change everyone around them. They’re the irrational ones upon whom all progress depends, the ones who insist that the world should change instead of them.
And I think that there’s nothing that Leslie Knope would rather be.