Thanks!
The thought has crossed my mind. I do find superheroines in general very sexy, but Phoenix was definitely the top of my list as far as costumes, so I don't have as much of a sense of urgency about any others. (Did you have any specific ones in mind?)
The next item on my agenda is to make even sexier cheerleader variants; I made a rough mockup last night just screwing around, and it ended up looking way better than I expected it to for that first pass. So, at the very least, I'm definitely not gonna be doing only superheroes. But I did save the GIMP file of the Phoenix Top in multiple layers, with the base layer just being a plain green full bodysuit, so I may recolorize that for all the different dye options and put it in as a one-piece or something. And the same could certainly be done for the boots, gloves, and sash. So from there, you'd have over a hundred generic superhero costumes just by mixing and matching colors, but of course that's never as good as the actual specific recognizable costumes.
I'll probably just keep reading comics (as I regularly do anyway), and wait for something that catches my eye and makes me think, "ooh, I'd love to see that costume worn by Akabur's Hermoine."