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.
She could go back in time to meet Tom Riddle when he was still a student at Hogwarts. This would be an interesting encounter as she could try to influence him in different ways compared to what actually happened in the original story.
One possible fanfiction could involve Bellatrix going back in time to try and change the outcome of the Battle of Hogwarts in her favor. Maybe she uses time - turners or some dark magic to travel back. She could attempt to kill Harry Potter as a baby before he even becomes a threat.
Bellatrix Black, in a fit of desperation to change the outcome of the Battle of Hogwarts for the Death Eaters, stumbled upon a time - travel spell. She traveled back to the time when Harry Potter first arrived at Hogwarts. She planned to kill him right away, but she was thwarted by Dumbledore, who seemed to sense something amiss. Dumbledore, with his great power, managed to trap Bellatrix in a time - loop for a while until she finally managed to break free. But by then, she had missed her chance to harm Harry and had to return to her own time, realizing that time itself was a powerful force that couldn't be easily manipulated.
One interesting 'Harry - Bellatrix time travel' fanfic could be 'Time's Twisted Path'. In this fic, Harry accidentally travels back in time and encounters Bellatrix in her Hogwarts days. It's a fascinating read as it shows a different side of Bellatrix before she turned dark. The author does a great job of exploring the dynamic between the two characters in this alternate timeline.
She could travel back to the time when Voldemort was still in hiding as a young Tom Riddle. Bellatrix might try to influence him in a different way, perhaps making him even more ruthless. This would change the course of the wizarding world in a very different direction.
In a time travel scenario, their relationship could become a complex love - hate relationship. Bellatrix may find herself attracted to Harry's courage and determination in a different way than she's used to. Harry, while disgusted by Bellatrix's actions in the original timeline, may start to see a different side of her when they are in a different time period. This would be a very strange and morally ambiguous relationship, full of internal and external conflicts.
Well, in some fanfics, time travel is more complex. There might be special portals or ancient magic that allows for time travel. For instance, there could be a hidden chamber in Hogwarts that holds the key to traveling through time. And the consequences of time travel can range from minor changes in the present to completely rewriting the future of the wizarding world. Sometimes, characters find that they can't change certain events because they are 'fixed points' in time, much like in some theories of time travel in other science - fiction and fantasy works.
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.
Another amazing one is 'Back to the Beginning'. This fanfic takes the idea of time - travel and uses it to explore the early days of Hogwarts and the relationships between the founders. It's filled with a lot of mystery and intrigue as the main character tries to figure out how to use their time - traveling ability to make things right in the past without completely disrupting the present.