There are many Hermione time travel fanfics. In some, she travels back to her first year at Hogwarts. She could use her knowledge from the future to outwit Voldemort's plans even earlier. Maybe she'd share some of the secrets she learned later with Harry and Ron right away, making their fight against the Dark Arts more efficient.
One great fanfic could be where Hermione discovers a time - turning spell she didn't know before. She decides to take Harry with her to go back in time to the first year at Hogwarts. They plan to change some small things, like making sure Neville doesn't lose his Remembrall so easily. This could lead to Neville being more confident earlier in the story and potentially changing the whole dynamic of how the students face Voldemort in the later years.
In some Hermione time travel fanfics, she might use time - turners in a more extreme way than in the original books. She could end up in a different era altogether, like the time of the founders of Hogwarts. This would open up a whole new world of magic and mystery for her to explore.
In a time - travel Bellatrix fanfic, she might go back to the time when she was first introduced to the Dark Arts. This could show a different side of her, perhaps a more innocent - looking but still dark - inclined Bellatrix. She could interact with younger versions of other Death Eaters and form different alliances that change the course of the future in the wizarding world.
A really popular one is 'Back to the Beginning'. In this fanfic, Harry and Hermione travel back to their first year at Hogwarts. It's full of heartwarming moments as they try to fix things before they go wrong. The author does a wonderful job of capturing the essence of the original series while adding their own unique twists.
A fanfic could revolve around the idea that the sand phoenix is a key element in a time - traveling prophecy related to Harry Potter. Harry discovers an ancient text that mentions the sand phoenix and its connection to time. He embarks on a journey through time to find the sand phoenix, facing many challenges along the way, such as dark wizards who also want to control the power of the sand phoenix for their own evil purposes.
One possible fanfic could be about Harry using a time - turning device during his first year to go back and prevent Draco Malfoy from making some of his early bad decisions. Maybe Harry witnesses young Draco's insecurities that lead to his later mean - spirited behavior and tries to change things for the better in their relationship.
There may be some fanfics out there with this premise, but it goes against the general relationship dynamics in the official 'Harry Potter' universe. Usually, Harry respects and values Hermione. If such a fanfic exists, it might be written by someone who wants to explore a really dark or different side of the story, like if there was a major event that made Harry turn against Hermione in that fictional narrative. But I haven't actually come across one myself.
One popular 'Harry Hermione time travel fanfic' is 'All the Wrong Choices'. It takes the characters on an unexpected time - traveling journey with lots of twists in their relationships and the overall plot.
A popular time travel fanfic has Harry and Hermione going back to the Triwizard Tournament. They try to prevent Cedric's death. Hermione uses her vast knowledge of magic to try and figure out a way to stop the events that led to Cedric's untimely end. Harry, on the other hand, is focused on stopping Voldemort from using Cedric's death to fully return. This fanfic is full of suspense and emotion as they race against time to change the fateful events of that tournament.
One great 'Harry Potter x Hermione' fanfic is 'Harmony's Dawn'. It beautifully portrays their relationship development in a post - war Hogwarts setting. The author does an amazing job of showing how they support each other through the rebuilding process.