Check out Wattpad as well. While it's known more for original stories, there are also a good number of fanfictions. Just be aware that the content on Wattpad may not be as well - moderated as on AO3 or FanFiction.net. But if you're patient and do some digging, you might come across some great Harry Potter and Hunter x Hunter fanfictions.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including ones that combine Harry Potter and Hunter x Hunter. Another option is FanFiction.net. However, the quality can vary greatly on both sites, so you may need to read through some summaries and reviews to find the really good ones.
Some Tumblr blogs are dedicated to sharing and discussing fanfictions. You can search for tags related to Harry Potter and Hunter x Hunter fanfiction on Tumblr. There are also some smaller, more niche fanfiction communities on Reddit. For example, there might be a subreddit specifically for crossover fanfictions where you can find some hidden gems.
If you want the clearest chapter reference, go to Chapter 80. Early on, Jiang Yan and Wen Jiaojiao, one so smug he was almost ascending to the...; later, the chapter leans on And this was exactly the scene Director Sun wanted to see..
The best chapter pointer here is Chapter 85, "They must have been bought off by Jiang Li!". It opens with Facing everyone's skepticism and curiosity, Jiang Li explained fluently:... and closes on This fresh and vibrant flavor blended perfectly..
A practical answer is Chapter 47, because it turns the idea into a concrete scene. The chapter opens with Qi is actually second???] [Did the production team make a mistake?, adds pressure through The internet is so chaotic, all that previous slander might as well have..., and ends on Qi is so.
If you want the clearest chapter reference, go to Chapter 88. Early on, She wanted to refuse, but didn't have the courage to do so.; later, the chapter leans on The Chen'an Entertainment she worked for was currently the largest....
Look to Chapter 46 for the clearest answer. It begins with Upon hearing this, everyone but Jiang Li perked up with high alert., keeps building through After all, there were only a few who didn't care how others saw them., and lands on Did you calculate the score incorrectly?!" And 13 points?!.
Chapter 88 is the strongest chapter-level answer because it starts from She wanted to refuse, but didn't have the courage to do so. and follows through on Let's go," Jiang Li said in a soft voice..
Look to Chapter 79 for the clearest answer. It begins with Jiang Li leisurely said, "I bought this weeding machine, and according to..., keeps building through He, himself, had just finished weeding a piece of land, and to top it off,..., and lands on Um..." Wen Jiaojiao bit her lip, "Could you.
Chapter 105 is the strongest chapter-level answer because it starts from But this did not elicit any sympathy from the woman on the phone; on the... and follows through on However, the next second, things took a turn..
If you want the clearest chapter reference, go to Chapter 104. Early on, Zhao Lang let out a light chuckle, "Young Master Jiang, don't be nervous,...; later, the chapter leans on You're Daddy's guests, how could I possibly come to settle scores with....
If you want the clearest chapter reference, go to Chapter 39. Early on, Qi Tianyu had been looking forward to watching Jiang Li's drama unfold.; later, the chapter leans on But to his surprise, Wen Jiaojiao, who seemed to possess some strength,....