Antagonist

The antagonist in the movie Stranger than Fiction was Karen Eiffol. Karen was the writer of the book that she was writing in movie. Karen wrote a book based on Harold Crick's life, and as she would write something in her book, things would happen to Harold as she wrote it. Once Harold figured out what Karen was up to, he did all he could to find her and convince her to change her mind about the ending of the book. Karen did write the ending of the book with him dying, but later changes the ending to Harold getting hit by the bus and later living in a miracle, all thanks to his wrist watch that was embedded in his wrist.