I don’t read words in any voice other than the naturally subvocalisation that occurs when I’m reading, which is always in my voice.

Even when I read a quote myself Morgan Freeman, I’m hearing my voice, doing a Morgan freeman impression.

But in terms of who I picture? Nothing, people online are not even corporal beings to me until details are revealed. They are still human and have whole lives offline so that’s not an excuse to be needlessly rude, but I know nothing of them so why would I randomly invent details unless I’m doing so as a “put myself in their shoes” thought experiment.

But then I have a degree of aphantasia so I’m not “picturing” anything, all I have is words anyway, so it’s easy not to add in extra words that change my assumptions about a person.