If DC were going to go after someone doing superhero/heroine parodies of their property, they'd probably pick Vivid. You know, cause Vivid has money, so if DC wins they'd get their damages, eventually, after appeals. So why don't they? Probably cause Vivid has been doing parody porn for many years (decades), has good lawyers, and DC guesstimates they would most likely lose to the parody, fair use defense.
Parodies: The discussion that suggests that the more one deviates from say, Wonder Woman character, look, style, tone, story, etc. the safer ground you're on is actually the opposite of the truth (when it comes to parodies). When you're doing a parody of something, you're commenting on it in some way, and the more you nail the subject matter, the more obvious it is that your parody is in fact a parody. The more you deviate, then the more into a grey area you get. Change the name too much, change the costume, the colors, give your so-called parody of WW an eskimo accent, give her other powers, change her origin, the more you'd be getting away from parody and fair use goes more and more out the window.
The above only applies to parodies. Totally different thing with original characters. If you're attempting to do an original character, and your original character is a heck of a lot like WW, so much so that it's obvious to most people, DC could have a copyright infringement case to make.
An aside: One thing I've noticed that Vivid does avoid using in their parody videos, superhero or otherwise, is trademarked things: ala logos. They nail the costumes really well, even improve on them, pick appropriate looking actors/actresses, but they don't use the Superman, Batman logos. Hmmm. They did use Riddler's '?' logo (not trademarked). So why does Vivid parody the IP of others, but not trademarks? Well, I'm not really sure. Could be while Vivid is pretty confident in being able to defend against a copyright infringement suit using the fair use, parody defense, they're less confident about winning against a trademark dilution suit. But I don't really know. Though I do know Vivid's not stupid, got to be a reason, so use trademarked logos at your own risk.
![Superman :supes:](./images/smilies/superman1.gif)