In Green Lantern's case, that list was actually bigger than usual. There's always lots of one-off characters that are pretty inconsequential, but in the case of Green Lantern there were quite a few semi-recurring characters that I wound up leaving out. So many, in fact, that I felt like I needed to throw up a blog post just to explain WHY.
Hector Hammond is, somewhat inexplicably, a major enemy of Hal Jordan's. He was even included in the Ryan Reynolds movie, getting so much screentime I actually felt like I was going insane. I've never read a version of this character that contributed in any way to my enjoyment of the character, he always just felt like a lead weight in the plot.
It's not like this concept can't be done in a fun way. Everyone loves Modok. Ultimately, thought, Modok is rediculous and acknowledges it. We're somehow meant to take Hammond seriously, and that's just never going to happen.
The Tattooed Man
This guy and his ability to animate his tattooes has been around a LONG time. He goes so far back that his original incarnation basically looked like Popeye. There was even an attempt at a heroic version of this character during Final Crisis. At some point thought, you have to just look at a thing and say... why? There's just no way to make this guy make much sense.
I have no reason to exclude this character other than the fact that I have yet to find any story anywhere that justified him. He's an alien scientist. That's literally it. There just doesnt seem to be anything in his story that makes him stand out in any way that made it worth creating a use for him.
I mean, the costume is kind of cool, maybe. But Starro and Despero already exist. He's just a weaker version of a concept that has been done much better in a lot of other places, and without a more concrete contribution to the narrative, there's just no place for him.
Goldface started out as a Green Lantern villain, but later on was also associated with the Flash. In either case, however, he made almost no impression whatsoever. He's a "criminal scientist" who drank a serum that gave him strength and invulnerability. If anything at all, he presented a challenge to Hal because he was yellow. That's just such a limited character, I couldnt begin to think of some way to make him useful. I have a LOT of "criminal scientists" to invent functional backstories for, so they really need to bring SOMETHING to the table.
While he's technically a Captain Atom villain, Major Force is so closely associated with Kyle Rayner that he managed to effectively become his arch-nemesis.
The problem, of course, is that the guy has no personality and no motivation beyond just being a bad guy, and is responsible for one of the singular worst story beats in comics (which is saying something, because comics can get really messed up sometimes.) We've done a good amount of work to try to strip away some of the ugliness from that story, and one of the easiest parts of that was to just bin this character completely.
I have never for the life of me understood what this character is even doing here. He's a shark that was mutated by atomic radiation so that he grew a humanoid body, and telepathic powers. I mean, this is the same medium that brought us Gorilla Grodd... but...
Even if we didn't want to use him as a Green Lantern villain and decided to use him as a baddie for Aquaman which would MAYBE make a little sense... this dude also exists in the same comic universe as the infinitely more entertaining King Shark. There is literally no point to him at all.
Modern readers probably won't even recognize this version of Black Hand as he's been so thoroughly reworked into the new mythology of the multi-colored lantern corps as the weilder of the Black Lantern ring... which is powered by the emotion of... death? or something? This is really where I tuned out.
But even if you wanted to use Black Hand's original incarnation he's just a guy who invented a gadget that allows him to absorb Green Lantern constructs. There are ways to Force this to work, but at some point you have to stop and recognize that you're not adding anything new or interesting to the story. It's just one more baddie for the sake of adding one more baddie.
As usual, I'm totally open to hearing your ideas. If you think that one of these characters, or any other characters that I might have left out deserve to be included, then by all means, let me know! I'm totally willing to entertain any feedback you might have.