Quirkiness in my DS6:

1. Funny/intense interests- for instance, last night he made up of a multiplication game and became so wired by it that he had trouble falling asleep
2. Big words and interesting/hilarious/sad observations about the world around him.
3. Intensity- becoming over the top upset by small set backs and disappointments.
4. A big disparity between emotional maturity and intellectual maturity. He can be impulsive and can have occasional difficulty relating to other children (although he is very interested in having friends)
5. Mild social anxiety

As far as we know, he's not 2e. He falls into the HG range.