Jester David
Hero
well I'd argue that there is no room for Iron Fist but okay I get your point
still all those properties are lucky enough that they come across as different genre, Supergirl and Greatest American Hero seem to share a similar genre slot (geeky girl, coming to terms with powers, assisted by government agency)
Right, but in one instance she's an alien pretending to be human who knows how to use her powers very well after the first couple episodes. In the other, the powers are granted by a suit that is hard to control.
One is a straight drama, the other likely dramedy if not straight comedy.
When you remove the two common elements (female main and government agency) and they're nothing alike.
And really, the gender shouldn't matter at all. It's not like people questioned the need for Flash after Arrow because it was going to be about a dude in a costume fighting crime with their ensemble of teammates.