What type do you think is the most likely to seem like another type? For the sake of clarity, I'm talking about from the point of view from other people who don't know the person being typed on the deepest levels.
I think it's the ENTP.
I'm asking you because I want to explore your ideas, but I also want to share some thoughts about ENTPs, which is how I got the idea for this thread in the first place.
My number one reason for suggesting the ENTP is that I believe we are all very experimental in nature. We are big thinkers who get off on playing with our ideas. This is probably one of the most notable traits of the ENTP. Extroverted Intuition, the lead function, keeps the ENTP expansive, open-minded, and fluid. They are always reaching out and exploring, questing after whatever seems fun or whatever seems worthwhile.
Since ENTPs are so experimental in nature, and since we have such a strong desire to test our ideas and actually use them, we could end up doing anything, at any time, in any way. (More than most types.) ENTPs love challenges and they are creative. So, an ENTP who decides that acting like a J makes more sense (Ti) can easily adopt J-like traits. An ENTP who thinks it will be fun to experiment with feelings (Ne) will find himself being more open to that kind of thing.
I think they love trying new things, and more often than not, they are their own biggest experiment, so they don't place very many limits upon themselves. And when they change, or try something new, they don't feel like they are being fake. To them, to expand is the only way to be real.
On the one hand, we can be very practical about some things, and will tend to seem more like sensors. I can seem like an S in the way that I do things. In the way that I think, and dream, I seem way more like an N.
It's been discussed throughout this forum that ENTPs are one of the most, if not the most, introverted extroverts. All of those arguments apply to this one as well.
ENTPs have the unique quality of being NP and ET at the same time. NP enough to be like INTPs and INFPs, but ET enough to be comfortable hanging with the ESTJs and ESTPs.
When your foundation is Ne, I think it's hard for people to predict why you're doing a certain thing or acting in a certain way, and this makes the ENTP easy to mistype by other people.
I'm sure I could ad more, but that's more than I planned on writing anyway.
I'll pick another type so I can offer an unbiased opinion as well. ISTJ. They're not quite as dull as stereotypes say they are.
And just for fun, which type is the easiest to type accurately?
ESTJ. You can't miss the dominant Te with SJ motivations.