Superhero or villain names usually represent their essence so you can't just make up something.
And if you want some good ideas you should tell whast kind of superheroes they are.

If they are just any generic superhero in the place where everyone is the superhero, you can just use some random good sounding words.

I think in your story, good names would be Bunny (to refer to her big breasts and friendly character) and Fox (as someone who is clever and probably will resort to dishonest tactic later)