rambling
Maybe something like “a person who exists in a completely parallel society from humanity, or who is actually detached from the political”. They can do Great Things, but never change anything. They have a psychotic, maddening, power concentrated in themselves that defies the human agency of all around them, but mostly concern themselves with negating the ones who use it that way. If all superheroes and supervillains disappeared, nobody would notice, they leave no ripples on history. Or, perhaps they’re like the weather. Or police.
A superhero only really interacts with other superheroes or supervillains, they don’t impact the real world outside of a few personal relationships. Their adventures might save many lives, but they don’t stop the genocide - saving a schoolbus full of children from going over a cliff certainly matters a lot to those kids and their families, but there’s always another drone strike.
Ah, like the opening chapter of Miracleman. A dreamlike heroism, which can play with the words and shapes of the real world but cannot challenge them. Vast emotions, and a vaster repression.
Though, sure, there are plenty of comics that would challenge that.
tl;dr - a superhero does nothing, very loudly.
Please don’t put spoilers in titles.