At first, everyone thought that this idea was way too far-fetched to be true. However, it soon was revealed that the conspiracies were right! The final trailer for The Crimes of Grindelwald revealed that Nagini was in fact originally Kim’s character. This was an upsetting revelation, as any Harry Potter fan knows that Nagini is destined to become a controlled animal. The saddest part is that she would later turn into a Horcrux, and then be tragically killed.