Anywho...I think I seem more like an INTP on these forums because I still naturally mimic the people I am around even though I don't do it as much as I used to. There are a lot more introverts around here than extraverts, so I lean more on my most comfortable introverted function Ti.
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I also would have thought that Mycroft is an INTP just based on the way he writes. For some reason, many IxTPs seem to post with a very limited use of smilies. (Obviously, there are exceptions.) But I dunno, the INTPs here tend have a much more dry and subtle wit compared to the INTJs, who are inclined to be more smart-ass (and even goofy) and less sparing of smilies. (Like FMWarner and Metamorphosis, for example!)