In my workshops and private consultations, I talk extensively about the idea that character is structure, and plot is what happens when characters pursue their objectives. When I was a young man I read everything Vonnegut wrote, then read it all again. As usual, he speaks about craft better than nearly anyone else, and does it with the simplicity of a master. Here's an excerpt from an interview he did with himself (!) in The Paris Review.
"I guarantee you that no modern story scheme, even plotlessness, will give a reader genuine satisfaction, unless one of those old-fashioned plots is smuggled in somewhere. I don’t praise plots as accurate representations of life, but as ways to keep readers reading. When I used to teach creative writing, I would tell the students to make their characters want something right away—even if it’s only a glass of water. Characters paralyzed by the meaninglessness of modern life still have to drink water from time to time...When you exclude plot, when you exclude anyone’s wanting anything, you exclude the reader, which is a mean-spirited thing to do. You can also exclude the reader by not telling him immediately where the story is taking place, and who the people are [and what they want].
And you can put him to sleep by never having characters confront each other. Students like to say that they stage no confrontations because people avoid confrontations in modern life. “Modern life is so lonely,” they say. This is laziness. It’s the writer’s job to stage confrontations, so the characters will say surprising and revealing things, and educate and entertain us all. If a writer can’t or won’t do that, he should withdraw from the trade."