You can start by using Tumblr's search bar. Just type in 'Harry Potter fanfic' and it will show you a bunch of posts related to it. You might also want to follow some Harry Potter - related tags like #HarryPotterFanfic, #HPFanfic. Another way is to follow Tumblr users who are known for sharing or writing Harry Potter fanfics.
The search bar is key. Type in 'Harry Potter fanfic' and then refine your search by adding more specific terms like 'time - travel Harry Potter fanfic' if that's what you're interested in. Tumblr also has a 'Related' section when you view a fanfic post. Click on those related posts to discover more fanfics. Moreover, following Tumblr events related to Harry Potter can expose you to new fanfics. For example, during a Harry Potter anniversary event, many users share their fanfics.
One of the popular ones is the story of a fan who accidentally wore their Gryffindor scarf backwards and walked around a Harry Potter event all day without realizing. People were giving them strange looks but they thought it was because they were such a big fan. Another is about a person who tried to make a Sorting Hat out of a baseball cap and some felt. It looked more like a lumpy blob. A third popular story is of a fan who thought they could speak Parseltongue after watching the movies too many times. They hissed at their pet snake and the snake just slithered away unimpressed.
One funny Tumblr story was about a fan who tried to make Butterbeer at home. They followed an online recipe but ended up with something that looked like green slime instead of the delicious drink from the wizarding world. Another was a story of someone trying to do the Patronus charm like in the books and movies, but their cat just stared at them like they were crazy. And there was also a story of a fan who went to a Harry Potter convention dressed as a house - elf and accidentally tripped over their long ears and landed in a pile of Bertie Bott's Every Flavour Beans.
One good way is to use Tumblr's advanced search options if available. You can filter by date (if you have an idea of when the fanfic was popular), type of post (is it a text post or an image post with the fic), etc. Another approach is to follow popular Harry Potter fanfic Tumblr blogs and ask them directly if they know the fic you're after. They often have a wide network and might be aware of it.
The popularity of 'Harry Potter Tumblr Romione Fanfic' lies in the fact that Ron and Hermione are two beloved characters. Fans love to explore their relationship further, and Tumblr provides a great platform for sharing these stories.
Well, Tumblr has a search function. Try typing in key phrases from the fanfic such as unique spells, locations, or relationships that were in it. Another option is to reach out to the larger Harry Potter Tumblr community. Post a description of the fanfic you're seeking, including details like the genre (is it a time - travel fic, a romance, etc.), the era it was set in (first year at Hogwarts or post - war), and any memorable lines. Some kind fans might be able to point you in the right direction.
One great 'Harry Potter Tumblr Romione Fanfic' is 'A Thousand Words'. It beautifully explores the relationship between Ron and Hermione in a post - war Hogwarts setting. The author really captures their personalities well.