For me different characters have different voices. The narrative is either the voice of the character whose perspective is currently shown (which can lead to conflicts if I don't know the perspective at the start) or it is how I imagine the author to sound like or my own voice.

Do different characters sound different or is there one ‘voice’ that acts as a narrator?

Neither. I think of the idea of the words, rather than hearing the words in my mind. Which is to say, though I can read a sentence and string together the words I read in my mind, the l there is no voice to those words, no gender, no accent, no volume etc.

I do read extremely fast in my native language (Spanish). Feels like entire sentences go straight into concepts and my brain builds a whole world based on what I'm reading.

However I started reading in a verbalized way with my second and third languages (English and Swedish) because I was completely useless at pronunciation, while reading at a high level. So I had to learn the sounds and they started invading my reading, which I sort of resent.

But the verbalization is still very mild; faint, monotone, non-enunciated.

Some people talked about poetry and I hadn't considered that my absolute lack of poetry-sense could be related. People have told me about the metrics and whatnot and it really doesn't click. I have to sort of analyze a poem and explain it to myself in prose, and I imagine that defeats the purpose of poetry?

I do wonder if not having to ‘hear’ words changes the rhythm of reading.

Hadn't thought of this...what's your take on poetry, especially meter-forward? Like, Robert W Service or Robert Frost, I feel would be less interesting if they didn't have their beat.

I don't do voices or accents when I read. Everything is in the same 'voice,' which isn't quite the same as my spoken voice. My internal voice enunciates much better and slightly lower pitch. It's more like the voice I wish I had than the voice I do have. :)

I am pretty sure it does. From what I've heard people that essentially "read out loud" inside their head tend to have a have a slower reading pace. I don't think Anauralia is necessary to not do that, either.

if not having to ‘hear’ words changes the rhythm of reading.

Poetry instantly comes to mind. I have a very different experience when I silently read poetry vs. reading aloud or listening to someone read it aloud, especially when the poem is written with rhythm in mind.

Oh yeah, often I'll even have a specific person in mind playing the character: an actor, someone I know, etc. I often don't even realize that I'm doing this

it depends on if I heard a voice of that character before for example Batman is always Kevin Conroy and the joker is always Mark Hamill. another usecase is if I listened to the audio book then start reading a text book. Ray Potter shows up alot.