The phrasing 'him and him and him' really threw me at first, but I'm guessing you're asking about that specific book title, 'Him and Him and Him'. I haven't read it myself—I saw the title pop up in some literary fiction roundups last year. From what I gathered, it's got a pretty small, intense cast focused on three men. I think the central figure is a writer or an academic, and the plot revolves around his complicated relationships with two other men who represent different parts of his life or maybe his psyche. Could be a former lover and a rival, or perhaps a brother and a friend. The blurbs made it sound like a deep dive into identity and desire, less about a big ensemble and more about this tripartite pressure cooker.
Without having read it, I can't name names, but the structure suggests the 'key characters' are literally just those three 'hims.' A review I skimmed mentioned it plays with perspective, so maybe we see events from each of their angles. Makes me wonder if the title is both literal and a bit of a joke—like, which 'him' is the real him, you know? I should probably add it to my list; sounds like the kind of thing that either wins awards or leaves you staring at the wall for an hour after finishing.