There are, in fact, a whole crapload of superheroes without any super power. I think it's rpetty much accepted, though, that to be a superhero you have to have some kind of extremely remarkable ability or weapon.
And if their abilities alone don't convince you, then give them an emblematic name/costume and they qualify.
And if their abilities alone don't convince you, then give them an emblematic name/costume and they qualify.