They have vivid imaginations
They're curious about everything, and are always asking "Why?"
Yes! - I think I was probably very annoying as a child because of that.
They enjoy spending time one-on-one with others, rather than in large groups
They're often off in their own world, and have a dreamlike quality
They enjoy art and music
Enjoy - yes, good at? - no
They love books, and especially enjoy fiction
Yes (as described above for IFP)
They're likely to hang back and watch before participating in a social situation
They're intensely private, and don't always share their thought and feelings
As a kid, that was very true, not so much as an adult.
They like structure and are unsettled by chaos or unplanned events
Overall, I think I have a small need/desire for structure, but I have a high tolerance for disorder and chaos so it takes a lot to push my limits there
They prefer sports that focus on individual performance rather than team sports
Yes - stuff like archery and fencing appealed to me a lot more than traditional athletic sports. I did try football and basketball as a young child, but it was all the rules you had to memorize that I couldn't stand, I kept getting penalties for offsides and garbage like that that eventually evolved (devolved?) into a hatred of team sports
They are perfectionists
They're serious and intense
Only about certain specific things, otherwise this is one area where I am much more "P" like.
They often seem older than they are, and may have older friends
Yup - for the most part, my friends were the friends of my older sister (many of which were also older than her)
They are original and independent, and value their uniqueness
They're not overly concerned with grades, but they want to completely understand a subject that interests them
Yes - This is much better description of me than the IFP notion of being sensitive to criticism in academics (I am sensitive to criticism about some things but not impersonal ideas). I don't know if I'd say I want to "completely" understand a subject, but I do want to feel that the understanding I have of the subject is sufficient to my standards and satisfies my curiosity of the subject and how it works