Hrmm... there are quite a few, really - of the INTP's:
Talullah, Nighthawk, JAVO, sometimes MacGuffin and Jennifer, and I'd include Geoff (InxP, last I noticed) too. But really, I'm probably forgetting at least as many people as I named, and there are a lot of other people who aren't INTP-ish that I relate to a lot as well. The vast majority of whom are INxx, and approximately the same age as I am. I think age and overall life circumstance affects this almost as much as type.
Of course, there are many, many more people I *like*, even if it takes a bit more work for me to understand where they're coming from .
I find it a little disturbing that much of what Synarch posts is what I was thinking, but unwilling to say. This happens occasionally with Night as well. Our synthesis of data is very similar, but the resulting conclusion reveals a different focus. Also, Night words his interpretation more precise, and Synarch more concise.
As far as tone and disposition go I find myself relating to sanveane and PinkPiranha. I also catch myself smiling at Edgar, EffEmDoubleYou, and Metamorphosis's dry humor because it's the sort of churlish sarcasm that pops into my head, but I am reluctant to voice. I think I frequently drift into an uncharted space between the INFJ, ENFJ, and INTJ temperaments.
"There is no god; there is only us. Savage and fragile."