That's always a cool thing to be the voice of what the eyes are seeing. It gives you the role of the Greek chorus and that's always fun to do.
I've always kind of gravitated toward characters who are a bit distant from the narrator or the point-of-view characters, so that's kind of important to me, to set up a different character who would be the point-of-view character for the story.
It is rare and almost impossible for a novel to have only one narrator.
When you pick up a book, everyone knows it's imaginary. You don't have to pretend it's not a book. We don't have to pretend that people don't write books. That omniscient third-person narration isn't the only way to do it. Once you're writing in the first person, then the narrator is a writer.
The narrator of a documentary often comes in at the last minute and takes some of the glory they don't deserve.
I was not aware of how much I loved 'Canoa' until I saw it after doing 'Y Tu Mama Tambien' and realized that my voice - over about the story's historical context - that narrator - came from 'Canoa'.
For the most part, romance is written in third person, and it's written in multiple points of view, so you're in the hero's head, and you're in the heroine's head. I've always said that I'm more of a narrator than a creator.
I always thought of documentaries as films through which you find your voice as a narrator.