Lots of superheroes are “children of the atom” in the sense that they derive powers from some sort of radioactivity (think Spiderman or Hulk or even Daredevil) while others are just born with powers without explanation (X-Men, Thor, Superman, Aquaman, Wonder Woman).
Who is a superhero that is somehow grounded in reality, meaning that they could “potentially” make sense (either their origin story is believable, even if it has some obvious gap to make a super power happen, or their power is somehow limited or constructed in a “reasonable” way).
I guess with these restrictions, Batman would be OK since he’s got no superpowers, but he’s insanely rich and therefore can both train himself and have access to sophisticated gadgets, but can you think of less obvious ones (even if they’re minor characters)?
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Wolverine is a mutant and was born that way, but the experiments added the whole indestructable skeleton on top of that. The only reason he survived the experiments in the first place was because he’s got crazy fast healing as a mutant power.
However, Deadpool might fit the bill, at least in some versions. He was given Wolverine’s healing factor in the same Weapon X project. It’s actually super powerful and would kill him if it wasn’t in a constant deadlock with his cancer which is also constantly killing him. There was a comic where Norman Osborn attempted to assassinate him by shhoting him with a cure for cancer…
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