I don't really know Geoff, so I can't say anything about him. But MacGuffin fits MBTI pretty well, I think, as an x(50/50 on the I/E axis)NTP. I'd say that you're the same in regards to the I/E traits by themselves, Edahn, although you don't really fit either INTP, xNTP, or ENTP very well, imo. Ivy, however, makes it look like the people who wrote MBTI were on crack.
I think Ivy uses Ne, and is an introvert. She could be an INxP or an ISxJ, the latter being more likely. Possibly she is even an extra-freak because she is an introvert, but isn't an INxP or ISxJ but still uses Ne very well.
Other than that I am completely lost. And I consider that the highest of compliments, because balance is something I think we should all strive for.
*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.