Hayner was a wall. He's sturdy and dependable (you could count on him to always do what he did best — be rebellious) and no matter what you threw at him, he'd send it back or die trying.
Hayner was stubborn and made of brick and if you butted heads with him he'd make you regret it, despite being four feet thick.
Hayner was nigh insurmountable, with about as many handholds as stainless steel, and just as friendly to strangers.
Hayner was a wall, separating his friends and enemies with one solid, blank, unblurred border that rarely opened and never crumbled.