I'm not sure. It depends on how the story is presented and what the author's intention was. Sometimes, stories labeled as possession could be based on real events, but often they are fictional creations.
Characters can resist possession by forming strong bonds with other characters. In a group setting, the support and love between them can create a sort of energy that wards off the ghost. For example, if two characters have a deep friendship, they can hold hands and focus on their connection, creating a barrier against the ghost's influence. Also, they can share their fears and strengths, and together come up with strategies to resist. This could involve things like creating a safe zone in a haunted place, or finding a way to communicate with the ghost to negotiate their departure. All these actions and decisions in the interactive story would determine the outcome of their resistance against possession.
Possibly. The idea of possession itself can be quite frightening. If the story plays up the fear factor, with descriptions of the possessed person's actions and the overall atmosphere of the situation, it would fall into the horror genre. However, it might also be a more serious exploration of a real - life event that doesn't rely so much on horror tropes but still has elements that could be considered horror - like.
Yes. The movie draws inspiration from some accounts that were thought to be true. However, in the process of making it into a film, a lot of creative liberties were taken. For example, the way the possession is shown in the movie might be more dramatized than what was originally reported in the real - life events it was based on. But overall, it has its roots in a true story.
Definitely not a true story. Grace: The Possession is part of the horror genre, where creativity and imagination take the lead to craft a suspenseful and terrifying narrative.