Source: writeups.com

9. The Fisherman

The Fisherman is a thief and a fence. With a dumb gimmick. He uses specialized fishing lures to fight superheroes and commit sea crimes. This is a bad gimmick. Fishing isn't scary. And neither is The Fisherman. Any of them.

Oh, yeah, there are multiple Fishermen. One appears in the perfect comic book, Gotham Central, in that series's penultimate story (and Infinite Crisis crossover) Sunday Bloody Sunday. A Fisherman appears on the streets of Gotham and attacks police officers as part of the Secret Society of Supervillains. He snags detective Crispus Allen with his fishing line in an attempt to strangle him to death. He would have succeeded if not for the fact that Driver and MacDonald immediately shot him to death. That's right, the Fisherman sucks so hard, he didn't even lose to a superhero.

He lost to the Gotham Police Department. An organization that can't even keep a scrawny professor who loves being afraid of things in jail, and they beat The Fisherman. Well, A Fisherman.

Why he isn't more popular: He just, like, sucks really hard? Not all of these entries are surprising. The others are better.