Well, some might consider 'god' the worst in fiction because in certain fictional portrayals, 'god' characters can be extremely powerful and controlling, leaving little room for other characters to have real agency. It can feel like a cheap plot device to just have this all - powerful being dictating everything.
In the Invincible comics, Amber goes through a series of events that shape her character. She might get involved in conflicts or have relationships that impact her. It's a complex storyline with many twists and turns for her.
As we don't know the details of the 'amber story', it could be a person named Amber. But it might also be that Amber is just an element in the story, like a magical amber object that is central to the plot, and the main character could be someone else entirely.
Some might say 'Moby - Dick' is a candidate. It has long passages about whaling that can be extremely dull. Herman Melville goes into such minute detail about the whaling industry that it can feel like you're reading a textbook rather than a novel. For those who are not interested in maritime adventures in such depth, it can be a tough read.
I'm not sure which novel you're referring to. Because different novels have different images and settings for Goddess Nüwa.
However, generally speaking, Goddess Nüwa was portrayed as a goddess or deity in novels, and she usually had magical, omnipotent, and world-saving abilities. However, in some novels, Goddess Nüwa's image might be considered bad because her existence might bring some negative effects such as causing disasters, destroying the world, and so on.
However, it should be noted that novels are a fictional art form, so the characters and plots in novels are fictional and may not necessarily have a reflection of reality.