There are fanfictions that focus on Bellatrix's relationship with other characters. For example, a story about her interactions with Narcissa. It could show a different side of Bellatrix, perhaps a more sisterly and protective side that we don't see much in the original books. Also, some fanfictions might place Bellatrix in alternate scenarios, like a modern - day Hogwarts where she has to adapt to new rules and a different magical society.
Some fanfictions might focus on Bellatrix's relationship with Voldemort in more depth. How her loyalty to him was formed and what she was really thinking during their interactions. For example, in some fanfictions, they might explore if there was a more complex emotional bond between them than just master - servant.
One interesting fanfiction could be about Bellatrix's early years at Hogwarts. It might explore her friendship or rivalry with other Slytherins. Another could be a story where Bellatrix has a change of heart after a magical encounter and tries to redeem herself. And there could also be a fanfic that focuses on her relationship with Voldemort in a more in - depth way, showing the power dynamics and her unwavering loyalty.
One interesting fanfiction could be about Bellatrix's early years at Hogwarts and her first encounter with a young Harry Potter in a magically altered scenario. It might explore how their paths could have crossed in a different way than in the original books.
In some fanfictions, there might be a plot where Bellatrix and Harry are forced to team up against a greater evil. For example, a new dark wizard emerges who is more powerful than Voldemort, and they have to put aside their differences. Bellatrix, with her knowledge of the dark arts, and Harry, with his courage and Gryffindor spirit, make an unlikely but effective duo.
Another aspect is her relationships. In fanfiction, we could see how she interacted with other Death Eaters in a more in - depth way. For example, her relationship with her sister Narcissa. How did their different views on Voldemort and the war affect their sisterly bond? It could also explore her relationships with other characters outside of the Death Eaters, perhaps a more complex relationship with a member of the Order of the Phoenix.
Another theme could be redemption. Although Bellatrix is a villain, some fanfictions might explore if there could be any chance of her changing or at least having a moment of self - realization in relation to Harry. It could also be about Harry trying to understand the reasons behind Bellatrix's actions. Well, fanfiction gives a lot of room for such creative interpretations. For instance, the exploration of their family ties in a different light, like how Bellatrix is related to Sirius and how that might affect her and Harry's relationship in an alternate story line.
One interesting aspect is her insanity. Writers can explore how she became so unhinged and what events in her life led to it. Another is her loyalty to Voldemort. It could be interesting to see how far she would go for him in different scenarios.
One popular 'Harry Potter Bellatrix' fanfiction might be those that explore her backstory in the wizarding world before she became a Death Eater. It could delve into her time at Hogwarts, her family relationships, and how she got involved with the Dark Arts. For example, a story could focus on her early encounters with Voldemort and how his ideology gradually influenced her.
One possible 'Bellatrix breaks Harry' fanfiction could involve Bellatrix using the Cruciatus Curse on Harry during his time at Malfoy Manor, but instead of breaking his spirit completely, it awakens a hidden power in him. Another might be a story where Bellatrix manipulates Harry's mind to make him turn against his friends, but he gradually overcomes it.
One interesting fanfic could be about Bellatrix's backstory and how it might have intersected with Harry Potter in ways not shown in the original books. For example, a fanfic could explore a scenario where Bellatrix had a chance encounter with Harry as a child before she fully committed to Voldemort's cause.