And if there's that much Kryptonite around, how can Superman function...
That's what I wondered about
Smallville for the better part of a decade. With all those "meteor rocks" around all over town, there should've been trace kryptonite contamination of the soil and water table and K dust blowing constantly through the air, and for Clark it would've been the equivalent of a human living near Chernobyl. He should've had super-leukemia by the time he was 30. (I often wondered if it was the reason he couldn't fly.)
Also isn't Jack O'Lantern a good guy and not a villain?
So is Jemm, Son of Saturn, but
Supergirl made him a villain. And Caitlin Snow/Killer Frost is a villain that
The Flash made heroic, although they're exploring her dark side now.
It used to be that live-action superhero adaptations on TV made up all their characters except the leads.
Batman '66's use of comics villains was almost unprecedented at the time, and even it had twice as many original villains as comics villains (though the comics villains usually showed up more often). The '90
Flash wasn't allowed to use comics villains until the back half of its season. Even
Smallville generally only introduced one or two comics-based Big Bads per season and went with original villains-of-the-week. But these days, it's become the norm to base as many characters as possible on antecedents from the comics, even when they're unrecognizably transformed -- like
Agents of SHIELD turning Lance Hunter, the debonair, John Steed-pastiche head of the British equivalent of SHIELD, into a stubbly, disreputable mercenary with a working-class English accent. They're still making up essentially new characters to fit their needs, but they keep giving them character names from the comics, even when there's little to no connection. I'm not sure whether that's because of some legalistic consideration (like the companies not wanting to pay royalties to the creators of new characters or something) or just to satisfy the fans' desire for continuity hits while balancing it with the need to create new characters that fit the story. It's probably a mix of both.