At the very first chapter of Haruki Murakami's 1Q84, Aomame talks with the taxi driver and the latter tells her she can use the emergency stairway to get out of the road.
But right before she exits the taxi, the driver says
And also please remember: things are not what they seem [...] It's just that you're about to do something out of the ordinary. Am I right? People do not ordinarily climb down the emergency stairs of the Metropolitan Expressway in the middle of the day [...] After you do something like that, the everyday look of things might seem to change a little. things may look different to you than they did before. I've had that experience myself. But don't let appearances fool you. There's always one reality.
From that we can deduce that the driver isn't just any random taxi driver, but someone who knows something about the 1Q84 world.
But, as far as I remember, he is never mentioned or appeared in the book again.
Who is the taxi driver?