This thread is to type my friend, C.
A little bit of background: C and I are both female, approximately the same age (mid-twenties). I am an INTP, although like many female NTs, I've been socialized into being (probably) a bit more emotional and outgoing than your average male INTP. Otherwise, I would say that I'm a fairly standard INTP.
C is quite withdrawn, much moreso than I am. Very, very introverted. She has panic attacks if in a large crowd. She is 'blank' expression-wise, and she has to get VERY emotional before she displays it in her voice or her face. This has gotten me into trouble before, as I inadvertantly kept bringing up something that upset her, but I was unable to spot any clues from her manner or voice that told me she was upset until she dissolved into tears (but keep in mind here that I am an INTP, and not great at picking up subtle clues to start with).
C has her areas of expertise that she's comfortable with, and doesn't venture too much outside her comfort zone. Sometimes she will tag along with me on my 'adventures' but I can tell that what exhilarates me is scary to her. Not a complainer. Not critical of others. The only times I've heard her express ire at someone is when a friend promises her something and then doesn't follow through (not me in this case, a different friend).
She is uninterested in clothing, jewelry, or anything of that sort. She is also a cuddler with people she's close to. I consider myself fairly affectionate but I'm not a 'handsy' sort of person, whereas she will rest her head in my lap, etc. if we're sitting on a couch watching a movie. We have compatibly kooky senses of humor (we got the best laugh one day out of going to a 'novelty store' and trying to read the synopses from the backs of porno titles to each other and keep a straight face). When she travels she likes to bring little favorite momentos of home to keep beside her pillow. Her home is fairly organized, but her decor is very much dominated by trinkets of one of her favorite hobbies (think people who love dragons and keep dragon sculptures, dragon books, toy dragons on their shelves, that sort of thing).
I am terrible at typing people. The only thing I can say for certain is that C must be an I of some type. I also don't think she's another INTP as I feel we are, deep down inside, rather different people, but beyond that I'm not sure what C is.