1. Official Publications:
* "Harry Potter: A History of Magic" (2017): This book delves into the magical world's history and includes information about characters, some of which was new. For example, we learn more about the lives of founders of Hogwarts and details about some obscure magical creatures.
* "Fantastic Beasts" series (2016-present): These films, written by J.K. Rowling, offer glimpses into the world of magic decades before Harry Potter's time, featuring new characters and expanding our understanding of magical history.
* "Pottermore" website: This website, launched in 2012, contained a wealth of information about characters, locations, and magical creatures, including behind-the-scenes insights and expanded character backstories.
2. Interviews:
* Numerous interviews: Rowling has participated in countless interviews over the years, offering tidbits of information about characters and their lives after the events of the books. This includes details about their careers, relationships, and families.
* Social Media: Rowling has used Twitter and other platforms to share additional information about the characters, sometimes responding to fan questions.
3. Specific Examples:
* The Marauders: Rowling has revealed extensive information about James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew, including their friendship, their time at Hogwarts, and their involvement in the First Wizarding War.
* Neville Longbottom: Rowling has stated that Neville became a successful Herbology professor at Hogwarts and a key figure in the Auror department after the war.
* Ron Weasley: Rowling has revealed that Ron became an Auror and eventually joined the Weasley family business, working alongside his brothers.
4. Limitations:
While Rowling has provided a lot of information, it's important to note that some details remain unknown.
* The "Cursed Child" play: Although Rowling approved the play, she has stated that she considers it a separate entity from the main book series and doesn't necessarily consider it canon.
* Personal interpretations: Ultimately, much of the characters' post-book lives remains open to interpretation.
Overall: Rowling has continuously expanded the Harry Potter universe through various avenues, providing fans with a wealth of information about the characters and their lives beyond the original books. However, some details remain open to speculation and personal interpretation.