Granted, all of the 10 girls - 11 if you count the unlockable "boss" character - can be a hero, a villain, or a superstar and their costumes, names, and signature moves change accordingly. But to be honest, the differences in their actual fighting styles and attacks are minimal, especially in the transition from good girl to superstar.
You do have several different types of special attack at your double-D-cupped disposal, including "H" moves designed to humiliate your opponent and the tag-team only "XX" super-moves. However, these enhanced techniques can only be used in specific instances, so they're rare. It would still be great to have a wider arsenal of regular attacks, as well as better balance and both more girls and more variation in skills and fighting "feel" from one girl to the next.
There are definitely big visual differences between babes, and there's a decent create-a-player mode in which you can tweak an existing hottie or design your owndrop-kicking, arm-breakingsex object. However, once they get in the ring, it tends to all still taste like a cheesecake buffet - and as good as that is, we'd appreciate a little more variety on the menu.