A plot could involve the daughter using her unique position to bring about peace. Since she has a connection to both the 'good' side through Hermione and the 'dark' side via Bellatrix, she could be the key to bridging the gap between the two warring factions. For example, she might use her knowledge of both sides' secrets to negotiate a truce.
Another plot could involve Hermione using her intelligence to uncover secrets within Bellatrix's family history that have been hidden for generations. This could lead to a strange alliance between them as they both seek the truth. For example, Hermione might find out that there was a powerful magic in Bellatrix's family that could be used to defeat a new dark force emerging in the wizarding world.
A plot could involve Hermione and Bellatrix both being Animagus and their forms having some sort of connection. For example, Hermione's Animagus form is a small, intelligent animal like an owl, while Bellatrix's was a large, powerful but dangerous bird like a raven. They unknowingly cross paths in their Animagus forms and some sort of magical bond or understanding starts to form between them. This could lead to a complex relationship where Hermione tries to use this connection to stop Bellatrix's evil deeds.
A plot could be about Hermione and Bellatrix having to work together to solve a mystery within the wizarding world. Maybe there's a dark magic object that is causing chaos, and their combined knowledge of magic, despite their differences, is needed to stop it.
One idea could be the forced marriage leading to a power struggle within the Death Eater ranks. Hermione, with her intelligence, might try to outwit Bellatrix and use the situation to gather intelligence for the Order. For example, she could pretend to be compliant while secretly passing on information.
One plot idea could be a magical accident that causes Hermione to take on Bellatrix's appearance. She then has to deal with the reactions of her friends and foes alike. For example, the Death Eaters might mistake her for Bellatrix at first and she could use this to her advantage to gather information. Another idea is that it's a curse placed on her by a dark wizard who wants to cause chaos in the wizarding world. Hermione would then have to find a way to break the curse while looking like Bellatrix.
One idea could be a time - travel plot where Hermione somehow gets sent back in time and has to deal with a younger Bellatrix. Maybe she tries to change Bellatrix's path to the dark side. Another could be a magical duel between Hermione and Bellatrix where Harry is caught in the middle, forced to choose which side to help. Or a plot where Bellatrix, under some sort of spell, has to team up with Hermione and Harry to fight a greater evil.
One plot idea could be that Bellatrix, in an alternate reality, has a change of heart and decides to protect Hermione from other dark forces. Maybe she sees a bit of herself in Hermione's fierce determination. Another could be that Hermione, while researching dark magic for a school project, accidentally stumbles upon a long - forgotten connection between her family and Bellatrix's, leading to a strange alliance. And a third idea might be that Bellatrix is cursed and Hermione is the only one who can break the curse, but in the process, they have to face their deep - seated prejudices about each other.
A possible plot is that Hermione discovers some long - lost secrets about her father, Sirius. This could lead her on a quest to uncover the truth about his past and his family. Along the way, she might find out about some hidden magical artifacts or spells that were associated with Sirius's family line. It could also involve her interacting with Sirius's old friends and enemies, which would create a lot of interesting dynamics. For instance, she might have to deal with some who are still bitter about Sirius or others who want to protect his legacy through her.
One plot idea could be Hermione discovering her true parentage through a series of magical events. Maybe she stumbles upon an old family heirloom that has a connection to Sirius. Another could be her having to deal with the reactions of her friends, like Harry and Ron, who are shocked by this revelation. She might also face challenges within the wizarding community as Sirius had a somewhat controversial past.
One plot idea could be Hermione's struggle to fit in among the other demigods. Since she's the daughter of Zeus, she might have immense power that she has to learn to control. Another could be her going on a quest to retrieve a powerful artifact that only she, as a daughter of Zeus, can handle. Maybe she has to face off against an ancient enemy of Zeus that has been awakened.