One that pops to mind for me is Francis York Morgan, an FBI agent, and the main character of the "horror" game Deadly Premonition.
He's an eccentric, but nice, character who has an imaginary friend he talks to named Zach who helps him solve crimes.
He seemingly only solves serial murders and not assassinating leftist leaders...as far as we know..
I haven't. But I feel like I really should write something up and publish it properly. While I'm sure I'm not the first person to ever think of it, it's an angle of moral philosophy I personally haven't seen discussed much.
I think this is also why, for example, villains can be redeemed in fiction even when they've done horrible things that we might not forgive in real life. In fiction, we can know that they feel true remorse and have truly changed. It also why I can support killing bad people in fiction when I don't support the death penalty irl. In fiction, we can know both their guilt and their irredemability with true certainty.
On top of that, I think fictional constructs like, say, an afterlife, can significantly change the fundamental nature of morality. If Valhalla or Elysium exists, then even war has very different moral implications.