I am the only one in the world with my name.
I was mentioned in an obscure song by a semifamous band (It wasn’t by name but supposedly it refers to me).
As I have mentioned on this board in the past, I have Situs Inversus Totalis. I usually win all the “unique” or “weird” contests with that one. My daughter even entered a study of me in a science fair in elementary school… 
I have the freakish ability to spot four-leafed clovers anywhere in any season. I have at any given time 20 or 30 pressed into whatever book I am currently reading, and inadvertently leave a trail of them in every waiting room I visit. I can spot 4-leafs from a (slowly) moving car, and frequently jump out at stop lights, pick one, and hand it to my companion. For some reason, this useless skill upsets people. Still I persist.
(If anyone needs a few for craft or jewelry making purposes, send me an address. Seriously. I have an ever-replenishing surplus of symbolic luck.)
I had a job afterschool when I was 14. That isn’t the unique part. I was a studio musician. I’ve played guitar nearly my whole life and by jr. high I was alright on a drumset as well. When a studio opened up near my hometown, they often got musicians who sang and played guitar, but had no band. I filled in on guitar when needed until I turned 16, then I started drumming with bands when they needed it…
Brendon
When I was a young boy, I had bright, straight, blond hair. When puberty hit, it slowly started getting darker and slightly curly. Now, it is what most consider a light brown, and if it gets long enough, curls up at the edges and on the front considerably. However, I still have bright blond highlights…in my eyebrows. I also have red hair…in my beard.
I too have given more than enough info on this board to easily identify me.
I have 8 kids. Certainly not unique in the world, but I have yet to see anyone posting to the boards who has more.
That’s 1 bio-kid, 3 step-kids, and 4 adopted.
I’m just shooting at worms in a barrel here. It was the first thing I thought of. You don’t have to divulge.
I could probably be easily ID’d with all the info I’ve given on the boards too.
What makes me unique currently is that I’m the oldest person in my classes. Advertising’s a young profession and I’m comparatively creaky at the ripe old age of 36.