You know, there's always that one villain who has a lot of potential yet never gets enough screen-time. Which bad guy, that fits this description, is your favourite? Is this villain of choice of yours really underrated? Would you like him to be the main villain in future stories? My pick would have to be the Human Fly. This guy started out as a massive badass who could take on Spider-Man and hold his own, similar to guys like Scorpion or even Venom, but he slowly became more and more threatening due to his mutations making him more fly-like in both appearance and behavior, until he turned into a complete monster, a cannibalistic ex-con and kidnapper who returned from hell and killed his girlfriend. He's still roaming around New York, torturing and eating people for fun. Although his potential has been well exploited, he's not a main villain anymore, and he totally should. He's still very underappreciated, and the fact that some diehard comic book fans don't know him is unacceptable. The Fly rocks!
What about Snowflame, a villain whose power was that fueled by cocaine. Not like a tongue-in-cheek metadrug reference to coke, explicitly powered by nose-candy. He had speed and strength, could impart white flames on things, and give people a contact high (or, I think, take away their buzz). Needless to say we don't see much of him these days. Snowflame (New Earth)
Snowflame is pure ham. We would probably see more of him if it wasn't for the fact that he died the same issue he appeared in.
Maybe not too obscure-- he did show up in BTAS afterall, but Maxie Zeus has always been a fav of mine.
Pfft, that was like half a dozen reboots ago. A lot of people might know about Hank Henshaw, the Cyborg Superman (especially given his role in Reign of the Supermen), but less probably know about his origin as basically a riff on Reed Richards and the Fantastic Four. Hank Henshaw - Wikipedia Crew of explorers, get irradiated, only their powers (and the radiation) end up horribly affecting them. The thing and human torch pastiches went crazy about their monstrous new bodies and killed themselves, and hank's body rotted away from the radiation (though he 'expanded his mind' and jumped into a computer system, gaining the ability to transfer consciousness between robot bodies he could assemble). His wife Terri saw his new robot body, and went a little crazy and also killed herself. Hank then left earth and... well, it gets weirder from there. There have been a lot of FF-parodies in comics, the more I think about it.
Ah, Foolkiller, one of the worst supervillains in comic books. Can't believe there's more than one of these guys.