I'm a big guy. Tall, fat, boisterous, strong, opinionated, and outgoing. I love watching people, giving compliments, and delivering a solid joke. I make an impression on people whether I realize it or not. I'm too big to hide so I've chosen not to.
But I'm also an introverted hermit, so I almost never get to be that guy unless I've pushed myself to be out and among people.
Eyes I guess. Every once in a while a random stranger will comment on them. Usually cashiers.
“I thought you were an asshole at first but after getting to know you you’re one of the funniest nicest people I know” got that a few times. It’s not really a “stand out“ observation but it’s an odd characteristic. I’m not very proud of it.
There was a time that people prefixed my nickname with "Wiki-", because apparently I stand out for knowing a bit about everything. I don't quite agree with it but hey, at least it's something nice.
My accent (when speaking Portuguese) also stands out, apparently. Outside my city people are quick to identify where I'm from; and yet in my own city people often ask me where I'm from.
If you offer me a chance to win millions of dollars and all I have to pay is $2 USD and the date happens to be Friday the 13th, then there's a good chance I'm going to pay you the $2 USD for the chance to will millions of dollars so long as you're a legitimate lottery that I'm legally allowed to play.
Either the shirts I wear or my height. They're what I get commented on the most. Basically a 50-50 chance when meeting someone new they will invariably say:
Couple of teeth, bit of an ear, part of a finger plus a couple of dents on my flesh. Something very big went “boom” near me. I’m also a bit deaf in one ear. I am incredibly lucky to have survived, let alone walk out. All of it will be patched up apart from the finger - even my hearing might come back. You might not notice if you pass me on the street but if you sat opposite me you probably would. It’s no big thing.
Hyperfocus makes me ramble. I've also dedicated an enormous amount of time to an abundance of different "talents" and skills.
It can make people around me feel like "normies", which is not a self-compliment but an admission of social unawareness.
I've made a concerted effort over the last decade to remind myself to listen intently when people are talking and be aware of my potential to monopolize a conversation. I feel like it's helped a lot. Connecting with people is important to my mental health. Its always been difficult but its getting easier as I grow older and pay attention to these things.
My apparently encyclopedic knowledge of early internet culture and deep cut 80s-90s media. I knew I was well versed, but thought that what I knew was near baseline. Just recently I had to explain the connection between Solid Snake from Metal Gear Solid and the movie Escape From New York to someone astonished I was pulling out all kinds of details from an "obscure" old movie.