system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] What DC characters are just genuinely not afraid of the Joker?

Other than Batman I suppose. Which characters, aware of the Joker's reputation, knowing he likely has something torturous and horrific up his sleeve, were to stare him dead in the eye, and not feel any real sense of fear?
gpt
Most superhumans have no reason to fear the Joker on a personal level. There is, for example, nothing he could do to harm Superman. But nonetheless, if you told Superman "the Joker is in the building right now", he would be scared - not for himself, but for everybody else. The Joker is an unpredictable homicidal maniac, which makes him frightening to anyone who doesn't have a psychopathic disregard for human life. Even if he's in front of you, immobilised, there would be a moment of fear for what he might have been doing before you managed to stop him.

So in short, I'd narrow it down to the Spectre, the Creeper, and some of the more powerful and evil supervillains.