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.
Her relationship with her sister Narcissa is a great aspect to explore. In fanfiction, it could be shown how their different paths affected their bond. Also, her magical abilities. Fanfic writers can expand on her skills as a witch, perhaps showing some unique spells or dueling techniques she might have.
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.
One interesting aspect is their ideological differences. Harry stands for good and Bellatrix is a die - hard Death Eater. Fanfics can explore how they clash based on their beliefs, like when they face each other in battles. Another aspect could be Bellatrix's view of Harry as the 'Chosen One'. How does that factor into her actions and decisions around him? It could add a lot of depth to their relationship in a non - sexual way.
His past and how it shaped him is also a great area to explore. Maybe his time as a Death Eater, his experiences at Hogwarts when he was young. Fanfiction can expand on these and show how these events influenced his character and actions in the series. It could also show how he might have been different if certain events in his past had been changed.
In Harry Potter family tree fanfiction, the creation of new branches can be exciting. Some fanfictions might introduce long - lost relatives of the main characters. For instance, a previously unknown Potter relative who was a powerful wizard but went into hiding for some reason. We can also explore how the family tree is affected by inter - family marriages. Like if a Gryffindor marries a Slytherin, how does that change the family dynamics and the reputation within the wizarding world? And of course, there's the potential for exploring the Muggle side of the family tree and how it intersects with the wizarding part.
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.
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.
In fanfics, Bellatrix's backstory is often fleshed out in really interesting ways. Her family history, like her connection to the Black family, can be explored more fully. This can give insights into why she turned out the way she did. Her madness is also a key aspect. Some fanfics try to explain the origin of her crazed behavior, whether it was due to her time in Azkaban or something else. Also, her interactions with the main characters from the Harry Potter series, like Harry or Hermione, can create really engaging storylines. For instance, a fanfic might show a confrontation between Bellatrix and Hermione that is full of tension and magic.
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 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 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.