#6 A great talker on the microphone
These days, pro wrestling promos have become somewhat formulaic. Either they are too long winded, too repetitive, or are just an excuse for the fans to chant catch phrases at pre-determined points.
But during Bruiser Brody's era, speaking to the crowd was considered an art form and a rare honor. Not every wrestler was allowed time to speak, and those that were had to get over a ton of information. Because it was pre-internet, they had to get across where they were actually going to wrestle. They also had to tell who they were wrestling, why they were wrestling them, and what it meant to them personally.
Brody was a master of this style of interview, and is credited with popularizing the 'shoot' style promo, where the fans wonder if it's the character talking or the wrestler portraying them.