Haha, I'd love to.... I'll try to keep this short and not ramble too much...
He's a very, very intelligent horse (sometimes, I think his brain actually works too much and he over-thinks things... it's fun to watch the wheels turning when I work with him though, haha), and exceptionally honest and transparent. He tries very hard to learn and picks things up very fast, good or bad, unfortunately... he's exceptional when it comes to understanding things, but convincing him that something is worth learning is a bit different. And I honestly believe he could give any mule a run for it's money, he's that stubborn... he doesn't throw tantrums like my other paint gelding, he doesn't make a big deal out of it, there's no outburst or anything, he just calmly refuses to do whatever it is. This is definitely not a bad thing, though, as he's usually doing it because I'm being unfair or some such. He's definitely not unreasonable and is very cooperative, but you have to let him use his brain and think for himself, or he gets surly and confused.
He's a problem solver, and always surprises me with his solutions to things- they're not always what I want, though, lol... it makes teaching him fun, because I never quite know what to expect from him.
He won't turn down a scratch or a treat, but he's much more polite with other people, while he's much friendlier with me- he's tense with others, although he's always polite and gentle... definitely people-oriented, but not overly friendly like a dog... Some horses are just really big golden retrievers who love everyone equally, not him, lol.
He loves to push buttons and see how far he can go with something, but in a playful manner, he's not domineering or aggressive- he won't take advantage of someone and is probably the most forgiving horse I've ever met. He has the brains, but needs that little bit of reassurance from someone else to really settle down into something. Probably the most sensitive horse I've ever been around. Once we get working and tuned in, all I have to do is think something and he'll do it. He takes a bit to warm up, but once he has his brain and feet going, he's fantastic. He's one of the horses that needs a quiet and contained person, he's never liked people with a lot of energy... I always kind of attributed that to his extreme sensitivity.
He has fantastic feet, I don't see anything but barefoot in his future so far, but we'll see. That's so good to hear, I used to worry about his late start a lot... I'm kind of glad about it now, though, that he's matured physically and mentally. It's actually making things a lot easier.
And I can't even tell you how he's changed lately, lol, he just kind of sprouted when he turned 6- he filled out and grew into himself, and mentally he's so much better. I can't wait to see how he changes in the years to come.
-edit- and no, he doesn't have a swirl on his neck. Thank you, deserthorsewoman! We just got a new farrier, so I'll ask him about his balance next time he's out.
He's got another year to complete his growing, I know my first one needed that time to widen all the way. You asked what he's built for. If you were doing dressage with lots of extended trot, he couldn't do too much due to the shoulder angle, and his trot would kill your back over time. When talking western or endurance....no problem, since you're barely sitting a trot. So, it all depends...... He looks like he could do just about anything.