I was curious what other ISTJs would say about this, but I saw ESTJ and INTJ further down their lists. These are the ones I've gotten closest to in my life other than ISTJness. I think it's my own personal experience that causes INTJ to be so high on the list. For me it would be:
INTJ (iNtJ, and female, who has learned competency in the social arena, which makes me hard to type if you run into me)
Types that I do appear as regularly
ESTJ (only when I need to Te people down and not appear like an overlord ENTJ, which as a female, when one needs to potently exhibit their Te, is generally less desired)
Types that I could fake
I don't think I could do INTP, interestingly.
*You don't have a soul. You are a Soul. You have a body.
*Faith is the art of holding on to things your reason once accepted, despite your changing moods.