Mainly, how grotesque can a character's means, or for that matter aims, be while still keeping the character sympathetic to a reader? For that matter, even empathetic? The reason I ask this is because it's partially just an interesting question, but also because I find myself asking this with characters of my own who have rather... dark aims, not just means. It seems like with means, the reader will tolerate pretty much anything as long as it's justified well. Rorschach, for example, despite killing, torturing, and having somewhat sociopathic characteristics at points is still a beloved character by many who is seen as the hero of the tale he's in. I have more thoughts, but am curious about others here.