“Do you know why people love serial killers?” “…why?” “Because they love the stories, they love hearing the terror we bring to others…humans as a whole love stories. And me? I’m the author of murder. blood is my ink and broken bones are the pen with which I write my stories of terror.”
In an AU Izuku is a detective who's going after a sadistic serial killer whos quirk allows him to write any stories he writes into reality. And out of desperation he asks toga for help with the case.