Each character requires different language, and these issues become inseparable. You have all these balls in the air: language, character, narrative. For me, the primary focus must be words, sentences, paragraphs.
If you directly try to write about an idea, it will never be what you imagined. But if you're imagining through the building of sentences, through the characters, and paying attention to avoid ease and comfort yet still thinking about making the sentences work, you will get a shot at some real interesting stuff.
You are always working towards the moments in which characters experience reckonings or insight or change. I like to track them past those moments.
There are lots of authentic, moving characters in so-called systems novels, just as there are certainly deep structural ideas in some character-driven novels.
I think there's a false division people sometimes make in describing literary novels, where there are people who write systems novels, or novels of ideas, and there are people who write about emotional things in which the movement is character driven. But no good novels are divisible in that way.
I am one Dana when I am talking to my daughter, another when I am talking to the IRS, and another still when I do an interview. These characters are just extreme versions of ordinary human self-switching.
I like to mix the real and the imaginary. Sometimes it is characters inspired by real people I know or know of. Sometimes it is a named person from the common cultural dreamscape. And it is tricky, because they have a lot of associated ideas that come with them, and a lot of actual facts.
Usually there is a paradox in what a character wants. A conflict is built deeply within them. And then you put them in motion, throw everything at them until they reveal themselves further.
I do want to write about social/cultural/historical context. I'm interested in relationships, in character, but within a specific social context. Which is kind of a political thing, I admit that. But it's what I'm interested in, and it's how I believe human behavior is legible.
When I write characters, I need to hear their voice. As soon as I get them speaking, and I feel how they use language, I understand who they are and what they want.