Well, where should we begin....
First of all, I can sometimes transform into an INTJ, given the right circumstances.
For instance, when I feel very strong and passionate about something, I become very stern and inflexible. Although, it may be a very weak version, compared to an INTJ -- it's like an INTP version of stubbornness.
I get stern, but I can still change my mind. I just won't budge too easy.
For example, I don't think there is a God. I intellectually don't see that as a rational plausibility (plausible possibility, likey?). Thus, I'll usually have a hard time discussing that idea with an open mind. Yet, if someone gives a good point, I'll eventually come around. I can be persuaded through reason to believe anything.
Secondly, I'm highly idealistic, to the point where I sometimes come off like an INFP. My feelings can cloud my reasoning and judgment and I can get very sentimental, emotional, and I'm very sensitive to criticism (which is not often typical of INTP's). I'm also very neurotic and emotionally unstable, which correlates more to the Enneagram 4 type (specifically 4w5). Although, I'm also undoubtedly a 5w4. So I'm somewhere in between those two types. I'm cerebral and emotional and artistic.
Also, I'm not as mathematically inclined or interested in 'doing' science as other INTP's might be. I'm also more artistic and abstract, as my Ne is extremely developed (to the point where I sometimes feel like I relate more to ENTP's, twith their high levels of ingenuity, creativity, and sense of possibility).
And there's other stuff, but that just about sums it up.