[Xanderfox]

Seems to me corruption as empowerment ought to be characterized as a "false" type of empowerment, that yes the corrupted person becomes stronger and more determined by sacrificing who they are or having who they are taken away from them. They haven't really been empowered they have been enslaved or replaced by a new entity and are more powerless than before.

Of course that really is for a deeper exploration of the concept rather than it as a sexual fantasy. In a fetish setting the "corruption" is more used as an excuse to have a submissive character act as the aggressor, allowing them to be depicted in a way that is opposed to their normal character. Of course as is often the case since the negative aspects of the change are ignored or thrown out many empowerment fantasy that could be called corruption are not recognized as such. Your Catwoman example stands out, because Patience is depicted as such weak person only the positive aspects of the transformation are acknowledged, the fact the original Patience has in essence died isn't acknowledged because the new Patience is meant to represent female empowerment. In reality Patience wasn't empowered, she was destroyed.