I also relate to practically all of fidelia's post... as per usual.
Some more additions to the list...
- Appear confident 24/7, to the point that even close friends don't realize that they have moments when they need reassurance
- Because of that confidence, may seem arrogant when they're often the exact opposite
- Seem so opinionated that many are afraid to debate them, even though they're much more easily convinced than you'd think
- Will almost NEVER admit defeat
- Contrary to popular belief, if they don't recognize a rule as being important, necessary or just, they probably won't follow it
- Very vocal about anything that they see as unjust, stupid or nonsensical*
- Have a strong innate talent for not thinking about things
- Easily embarrassed, especially by friends/family who draw a lot of attention
- Not very good at being teased sometimes (sometimes accused of "taking things too personally" or told that they "need to lighten up")
- Tendency to avoid strong painful emotions, and angriness at people who make them feel that way
*This happened to me in a cafeteria, when I heard about a "stupid" rule, got all hot and bothered, and practically interrogated the manager until I saw that the rule made sense.