Sully
In the first two seasons he's basically a loose cannon. Dangerous but also gets himself into situations that he can't really control. Dushane bails him out multiple times, particularly after he kidnaps his cousin. You get the feeling that he would have been dead long before if he didn't have Dushane on his side. When they come back for season 3 and a few years have passed in the story, suddenly he's John Wick. He's this conflicted anti-hero that can kill his way out of any situation.
I actually like the revival of the show so I'm not trying to criticize it. I just think that they could have kept Sully's character a little more grounded in reality.