here. We definitely have possession in SM Stirling's The Scourge Of God: a human body is almost visibly invaded by a hostile consciousness and continues moving with evil intent after it should be dead. I am having to accept that we are at last learning about whatever was behind the Change and am curious to know more about these malevolent entities.
I searched for an image of "possession" but the ones that I found were over the top so I thought that the attached "Syllabus of Errors" might be of interest. Eat meat and do not read Tolkien or Harry Potter. All fantasy and science fiction should probably be on the list.
How do some people get their heads into mental spaces like that?