>>4851612See OP it's hard to point a single characteristic because Bret was amazing at everything a wrestler should be, which funny enough was his one biggest curse, because bookers and promoters would always "fit" him in any story to give it importance or volume without caring about making the most of Bret's potential.
Nonetheless, Bret's in-ring psychology was absolutely amazing, no one could or can come up with a match the way he did, he could carry a stone or a hamburger to a WM main event spot if needed and it would be the fucking match of the night (see his infamous match with the British Bulldog at summerslam)
Now as for his storylines and matches, the whole HBK, 'carder, Owen and Austins are obligatory and a good spot to begin, but you can go back to the hearth foundation and see even more
btw, on this webm you can see exactly how great Bret is