Aqizzar is Brock Sampson in my mind. Has been in my head for years. It's largely the avatar. Also his no nonsense nature. Don't ask me why he's one of the only people I do voices in my head for. I read so fast I usually don't have time to do it with other things, truthfully.
The irony being that I didn't used to be Serious Business 24/7. We haven't had impromptu shenanigans around here in a long time.
I don't really have "voices" assigned to identities so much as tones. Higher and lower with a bit of pitch, vaguely relating to how "friendly" vs "gruff" I remember them as. The only time I even notice is when I start subvocalizing something, and half-way through realize it's not the person I thought it was. I will admit to a certain gender-bias in voice tones, but the same low=serious high=not thing applies, just the inflection changes.
It's odd that I don't apply accents, since I do apply accents when I'm reading a book or something and I have an idea of what a character is supposed to sound like. I even know what accents a few people here have. Maybe there's just too many of you.