1. When she revealed her second favorite Harry Potter character

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2. When she confirmed that Hermione wasn’t necessarily white
Canon: brown eyes, frizzy hair and very clever. White skin was never specified. Rowling loves black Hermione
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3. When she said this about Snape
Snape is all grey. You can’t make him a saint: he was vindictive & bullying. You can’t make him a devil: he died to save the wizarding world
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4. When she shared this sorting news
Have just heard that James S Potter has been Sorted (to nobody’s surprise) into Gryffindor. Teddy Lupin (Head Boy, Hufflepuff) disappointed.
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5. When she explained why Harry named his son after Snape
In honouring Snape, Harry hoped in his heart that he too would be forgiven. The deaths at the Battle of Hogwarts would haunt Harry forever.
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6. When she revealed that there are Jewish wizards at Hogwarts

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7. When she apologized for Lupin’s death…
Once again, it’s the anniversary of the Battle of Hogwarts so, as promised, I shall apologise for a death. This year: Remus Lupin.
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8. …and revealed she hadn’t planned on that until Order of the Phoenix…
In the interests of total honesty I’d also like to confess that I didn’t decide to kill Lupin until I wrote Order if the Phoenix.
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9. …and thinking of poor Teddy is the only thing that made her cry
Arthur lived, so Lupin had to die. I’m sorry. I didn’t enjoy doing it. The only time my editor ever saw me cry was over the fate of Teddy.
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10. When she gave some more insight into Snape’s character…
Snape didn’t die for ‘ideals’. He died in an attempt to expiate his own guilt. He could have broken cover at any time to save himself, but he chose not to tell Voldemort that the latter was making a fatal error in targeting Harry. Snape’s silence ensured Harry’s victory.
@jk_rowling[1][2]

11. …and finally apologized for killing him too
OK, here it is. Please don’t start flame wars over it, but this year I’d like to apologise for killing (whispers)… Snape. *runs for cover*
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12. When she revealed we’re all mispronouncing Voldemort

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13. When she confirmed there’s no tuition fee at Hogwarts

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14. When she explained why Hagrid doesn’t have a Patronus

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15. When she shared the one Harry Potter fan theory that holds up…

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16. …and the one that definitely doesn’t

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17. When she revealed Ron’s Patronus
.@juliannedapdap Ron’s Patronus is a Jack Russell, which was our last dog.
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18. When she celebrated Hufflepuff Pride
Sorry I missed Hufflepuff Pride, but I love Hufflepuffs. My family comprises 2 Hufflepuffs, 2 Gryffindors and 1 Slytherin.
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19. When she had some serious regret
It’s the 16th anniversary of the Battle of Hogwarts. I’m having a moment’s silence over my keyboard. I hated killing some of those people.
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20. When she beautifully reminded us we all went to Hogwarts…

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21. …and, finally, when she explained just how much Harry Potter has changed her life
20 years ago today a world that I had lived in alone was suddenly open to others. It’s been wonderful. Thank you.
@jk_rowling