Deadshot springs to mind.
Deathstroke certainly.
Scandal Savage & Knockout
Huntress
Arsenal
"My name is Wally West. I'm the fastest man alive!"
I'll try being nicer if you try being smarter.
Technically, in Future State Gotham, Jason Todd (Red Hood) did become a bounty hunter for a while. Then he got promoted to actual law enforcement. That also includes Ravager and a fairly minor character whose name escapes me at the moment.
Were any of the Manhunters actual bounty hunters? I mean, that's a nautral.