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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There are many that are results or accidents from experiments. The Flash got his powers from a lab accident. Iron Man’s suit is part of his own research. Cyborg from Teen Titans was an experiment from a father trying to save his son. Elonging Man did “a life research on yogi’s elasticity” to create a potion that gave him his powers. Plastic Man was also an “accident” with an unidentified chemical.
Ghost Rider and Spawn made deals with the devil to get powers. Spawn even has an actual limit on how much he can use his hellish powers