There's a reason why the first Injustice game was had the subtitle "Gods Among Us". It's because DC has some insanely powerful characters, some of them being quite literally gods.
Characters like Superman and Wonder Woman have proved again and again that they're the upper echelon of strength, given the fact can go toe to toe with powerhouses like Darkseid and Mongul.
But for every god, alien and demigod, there's a human being that's just as, if not more powerful than them. Sure, two members of the Trinity may not be human, but there's a reason Batman stands shoulder to shoulder with them, and it's not just because of his wallet.
Whether it's because of magic, atomic experiments, or because of awesome piece of jewellery, there are a lot of humans within the pages of DC Comics that can boast about being stronger than Superman.
A small but important disclaimer before we get into things, characters like Zatanna and Raven don't qualify, since Zatanna is a Homo Magi (literally a different species), and Raven is a half demon.
Now with that out of the way let's take a look at the some of the most powerful humans in DC Comics.
10. Plastic Man
Plastic Man is one of those heroes that the goofiness of his powers really betrays how strong he is. Along with being able to stretch his limbs, Plastic Man can manipulate his size and his density.
He can shape his body to into just about anything he sees, including something as large as a t-rex or as small as a bottle cap. We've never seen Plastic Man really have a limit when it comes to how large or how small he can make his body grow.
Given how elastic his body is, taking a punch from some of DC's heaviest hitters wouldn't really phase him either. Since he can also increase his density he's capable of delivering some haymakers of his own.
We saw in Injustice that he's also capable of subduing someone like the Flash by snaking his way into someone else's body and tightening his grip on their wind pipe.
The only way that probably could stop Plastic Man would be to steal an idea from Dr. Doom over at Marvel and simultaneously stretch and freeze Plastic Man until he shatters. Otherwise Plastic Man is unstoppable.