Loners

I've taken Myers-Briggs test many times since my teens (I'm 43 now) and I have always come up INFP.

I suppose it's possible my preference for T v F has changed over time.

These descriptions do suit me:

Precise about their descriptions, INTPs will often correct others (or be sorely tempted to) if the shade of meaning is a bit off. While annoying to the less concise (emphasis mine), this fine discrimination ability gives INTPs so inclined a natural advantage as, for example, grammarians and linguists.

INTPs are relatively easy-going and amenable to almost anything until their principles are violated, about which they may become outspoken and inflexible. They prefer to return, however, to a reserved albeit benign ambiance, not wishing to make spectacles of themselves.

INTPs and Logic -- One of the tipoffs that a person is an INTP is her obsession with logical correctness. Errors are not often due to poor logic -- apparent faux pas in reasoning are usually a result of overlooking details or of incorrect context.