In the 'last man on earth Karl story', Karl is the central figure. He could be an ordinary person who was thrust into this extraordinary situation of being the last human. Maybe he has certain skills or qualities that help him survive, or perhaps he has to learn quickly how to endure in this new, lonely world.
It depends on how you define 'true story'. While it's not a verbatim account of one specific incident, it incorporates real-life research and issues related to concussions in sports, so in a sense, it has roots in truth.
Well, it's not straightforward. 'Concussion' might incorporate elements of real events, but it's likely that some aspects have been fictionalized or dramatized to make it more engaging for the audience.
Not entirely. While it draws some inspiration from true events, it also incorporates fictional aspects to create a more compelling cinematic narrative.
The concussion might make the reader more sensitive to supernatural entities. They could see or sense them more clearly. For example, they might be able to hear the whispers of ghosts that were previously inaudible.