Hmmm -- to make them fit the theme -- but OTOH, the theme allows a lot of variation. There are many, many, many things that a villain can show are the wrong way to use powers, and that's not even getting into what powers the villain has. (Perhaps some debate about recruiting him to fighting crime vs. more peaceable law-abiding jobs for the question of useful powers? Perhaps some clearly villainous vigilantes? But what if a vigilante hero is really the only way to bring him down?)
Which does just go to show that one idea is not enough for a story.