Yes, there are. John Boyd has written some science fiction works that are quite interesting. They often explore unique concepts and futuristic settings.
John Walker was indeed part of the comics. His role and actions were crafted to add depth and complexity to the comic universe. He had his own unique set of challenges and achievements within the comic storylines.
Well, it's a bit complicated. John Walker's character in the comics had moments of going against the moral code, but it depends on how you define 'evil'. Sometimes his actions were driven by circumstances or personal beliefs that weren't necessarily purely evil.