Allen Coage (Bad News Brown in the WWF) was possibly Bret Hart's worst enemy. Bad News has commented in many interviews that Bret was the most difficult wrestler he ever worked with. And Bret Hart has called Bad News his nemesis (the only person he refers to as this in his book.) Unlike Shawn Michaels, they never buried the hatchet, although this is possibly because Bad News died in 2007.
In the days of the Hart Foundation Tag Team with Jim "The Anvil" Neidhart, the British Bulldogs (the Dynamite Kid and Davey Boy Smith), the Fabulous Rougeau Brothers (Jacques and Raymond), Demolition
Breakup Breakout: After he split from the Hart Foundation, Bret was catapulted to the main event. Ironically, Jim "The Anvil" Neidhart was initially considered to be the stronger performer. Bret's singles push came during the WWF's infamous steroid scandal, where McMahon wanted to push someone smaller.
But for Me, It Was Tuesday: At King of the Ring 93, Jerry "The King" Lawler objected to Bret being named "King" just by winning a tournament, and apparently stiffed Bret hard with a sceptre, and did so again with crutches at SummerSlam. Lawler had shown up on crutches in an attempt to get out of the match, and introduced Doink The Clown, still a Heel at the time, as his replacement. Bret basically squashed him, and Lawler threw down the crutches, thus revealing that his "injury" was faked, and attacked Bret, leading to Kayfabe President Jack Tunney forcing Lawler into the match. Bret claimed to have really cranked on the Sharpshooter in retaliation, though Lawler told him that he thought "that was how the Hart boys worked." They made up sometime later.
Canada, Eh?: Not normally the focus of his gimmick, but his 1997 heel turn played up his Canadianness as Hart would use it as a source of pride against Americans, who he believed didn't deserve a hero of his caliber.
Determinator: Bret once wrestled a match against Dino Bravo, which saw Bret get bumped a little too hard to the outside, where he broke his sternum on the steel guard rail. Despite Bret's nonverbal cues that something was wrong (i.e. he couldn't even breathe) the match kept going. Bret was supposed to win, but ended up losing by countout.
Friend to All Children: Bret would always give his glasses to a lucky child sitting in the front row during his entrance.
Handsome Lech: According to his book, he's slept with many women during his first marriage and doesn't fault himself for his actions.
Not so much that he doesn't fault himself, but more that he kept finding excuses to justify it even though he knew on some level that it wasn't ideal behavior. His biggest self-justification was that every wrestler needed to find ways to relieve the stress and boredom of spending 300 days a year on the road, and (in his mind) picking up women was far less harmful/destructive than using drugs and/or alcohol to cope with the stress like so many other wrestlers did.
Pet the Dog: Would frequently give out his Cool Shades to young fans at ringside. This is lampshaded by R-Truth, who borrows the shades to give to a kid, with the reasoning that it'd make him more popular and thus more likely to get a championship match.
Popularity Power: Bret is really, really popular in Canada. So much to the point that during an infamous promo by Shawn Michaels at Montreal in 2005, when Bret's music played and it seemed like he was going to come out and confront Shawn, the crowd erupted.
Worf Had The Flu: A rather literal case: just prior to the 1992 Royal Rumble, Bret, at the time Intercontinental Champion, had a flu that ranged at nearly 104 degrees. He lost the belt the night before the event to The Mountie, who then set the record for the shortest IC title reign ever when he lost it to Roddy Piper one day later at the Rumble itself.