Super Confusing

What defines a superhero? Clearly not just powers,
As many are supposed to have no greater ones than ours.
There also are some superpowered heroes (all in fiction)
Who never get the designation. What’s with the restriction?
How frequently they save the day is not the answer either.
They often aren’t that virtuous, depending on the writer.
It seems that only characters from comic books and those
Who mimic them are labeled thus—tradition, I suppose.