That does indeed sound amazing. If there was ever a way to separate Rowling from Harry Potter and create stories within it without financing her, I would be curious to see such stories produced in whatever form.
Get thee to AO3 (Archive Of Our Own) or fanfiction.net. There are over a MILLION Harry Potter stories/HP crossovers on those two sites alone. And there are other fanfiction sites I've vaguely heard of but haven't found.
There are some stories I've been following for
years, and in one case the author updates it like clockwork every Tuesday except when she's sick or on holidays. We've been able to correspond via the comment section, and so help me, she named a character after my dad. I just about cried (happy tears).
How that came about was Hermione was pregnant, the author asked us for baby name suggestions (keeping in mind that she already had a short list but might change it if another really good suggestion came along). Somewhere in that conversation about names, I mentioned the situation in my own childhood when my dad acquired 3 adult geese and a gosling as payment for fixing someone's vehicle (this was in the 1960s and he ran an automotive repair shop in our garage on the acreage).
The geese came with names. One of those names happened to be the same as my dad's middle name. We had a good laugh about it.
Several chapters later, Hermione had the baby. It was a boy. And the name she gave him was my dad's middle name (or the gander's name, however you want to look at it). The author told me this is why the baby was given that name.
The actual story is
Wind Up All the Clocks. The premise is that 6 years after the Battle of Hogwarts, Harry and Ginny are married. Ron and Hermione have split up and Ron marries Astoria Greengrass. Hermione is single... and then the Ministry of Magic brings in a marriage law.
So many wizarding people had been killed in the war, and the Ministry was concerned about the birth rate. So they brought in a law stating that all single people between the ages of 17-55 would have to marry and have 2 children within 10 years. They would have a little time to find someone, and then go into a matching pool. From there, they would have 3 chances to refuse the match chosen for them. After the third rejection, the fourth match would be compulsory.
Hermione's almost out of matches. She's rejected Goyle and Draco. The owl delivers the third one, and they all get a shock. The name is...
Arthur Weasley.
Ron is horrified, and Hermione is shocked. Not that Arthur's name is in the pool, since in this story Fred and George are fine, but Molly and Bill died in the fighting. Arthur has been a widower for 6 years, and he's only 54, so is still eligible for this law.
Hermione agrees to marry him, mainly because she trusts Arthur not to be cruel to her, and because she's terrified of being forced to marry someone like Lucius Malfoy (soon to be released from Azkaban and he's also a widower because Narcissa had killed herself).
Anyway, the story has been going on for years now, and I just read Chapter 202 yesterday.
Another story I'm reading has me in stitches.
The Muggle Death Eater and His Daughter is hilarious. The Malfoys run across the Grangers in Diagon Alley when the kids are shopping for school supplies. Lucius Malfoy happens to see that Hermione's father has a cadeucis tattoo on his left forearm... and immediately thinks it's a different sort of Dark Mark. Richard Granger happens to make a few comments that accidentally give Malfoy the impression that not only is he a Death Eater, but he's replaced Sirius Black as Voldemort's right-hand man.
This sets the stage for a completely different dynamic for Hermione and Draco (they're only 1st-years at this point), and Narcissa and Linda (Hermione's mother) become friends. I'm only up to chapter 9 so far (the Quidditch World Cup is about to start), so I have no idea how it's going to turn out. I'm enjoying it immensely, though.
And if fanfiction isn't your thing, how about fan films? There are some very good ones about the Black sisters, and about Neville's parents.
And how about this tribute to Severus Snape?
Honestly, there's so much more story without putting a cent in Rowling's pockets.