system
Given the following post, respond as if you're commenting on Reddit:
human
[General Superhero] Are there many instances where an enemy of the hero is fully aware of their secret identity but chooses not to reveal them or exploit that knowledge to their own advantage? And if not, why not?
gpt
With Batman there's quite a few villains who know but generally keep it to themselves for various reasons:

* Ra's Al Ghul, Nissa Al Ghul, Bane, Deathstroke, Lady Shiva, and David Cain because of their personal codes of honor.

* Riddler because he thought the value of the knowledge was devalued by how many others knew it- then he got some brain damage and forgot entirely.

* Talia and Catwoman because they love him even when they're against him.

* Hush because he wanted to maintain and use Bruce Wayne's identity for himself.

* Joker because acknowledging/accepting the fact that Batman has a life beyond the cowl ruins the fun of their dynamic for him.

They all have used the knowledge as a weapon against him at one point or another though.