The Harry Potter movies featured an increasingly captivating story, with characters such as Dumbledore, Hagrid, and Grindelwald occasionally taking away from Harry's own adventures. Together with Warner Bros., author J.K. Rowling brought her stories of the Wizarding World to screens all over the world after writing and releasing Harry Potter and the Sorcerer's Stone in 2001. The movie was a big hit and continues to enchant audiences to this date. Unknown to fans of the Harry Potter movies, Warner Bros. had to delete, or at least cut short, some major character arcs found exclusively in the Harry Potter books.
Source：https://www.cbr.com/best-harry-potter-character-arcs-plots-only-in-books-ranked/
