A plot could involve Harry dealing with the Black family's old grudges and feuds. As Lord Black, he has to sort out the mess left behind by generations of Blacks. He might have to mediate between different branches of the family who have been at odds for centuries. Harry could use his own experiences of friendship and loyalty from his time at Hogwarts to try and heal the rifts within the Black family. This would not only change the Black family but also have a positive impact on the overall wizarding society as the Black family has a significant influence.
One possible plotline could be that Harry discovers he has a hidden connection to the Black family that makes him Lord Black. This could lead to him having new powers or responsibilities within the wizarding world, and he might have to deal with the complex politics and family secrets of the Blacks.
Well, perhaps Draco has some new-found knowledge or a secret weapon that gives him confidence to take on Harry for the Lord Black title. Harry, on the other hand, may be initially reluctant to engage in the duel but is pushed into it to protect the legacy of the Black family. During the duel, they both could discover things about the Black family history that changes their perspective on the whole matter.
Perhaps Walburga realizes that Harry is the key to changing the wizarding world for the better. She could start teaching him about the history of the Black family, both the good and the bad, and together they could work towards a more inclusive and less prejudiced wizarding society. This would be a major shift for her as she comes from a family with a lot of dark and prejudiced views.
One possible plotline could be that Melania is a new student at Hogwarts who has a connection to the Black family. Maybe she discovers a long - lost Black family secret that could change the wizarding world. For example, it could be a powerful spell or a hidden treasure. Another idea is that she gets involved in a mystery related to the Black family's dark past and has to team up with some of the well - known Harry Potter characters like Harry, Hermione, or Ron to solve it.
A plotline might involve Sirius and Harry living together and Sirius trying to give Harry a normal family life. He could cook for Harry, help him with his homework, and they could have a pet together. Maybe they get a Kneazle, and Harry learns to take care of it with Sirius' guidance. This would be a contrast to the cold and often neglectful treatment he received from the Dursleys. And as Harry grows, Sirius could introduce him to his old friends like Remus Lupin in a more family - like setting, strengthening Harry's support system.
One plotline could be that Harry is influenced by the Dark Lord's ideology from an early age. Maybe he discovers some 'truths' as he sees them that make him believe the Dark Lord's way is the right one. For example, he might think that the wizarding world's current order is corrupt and only the Dark Lord can fix it.
Perhaps Harry is reincarnated as Lord Emrys in an alternate timeline. He then has to use his new - found identity and powers to reshape the wizarding world for the better. He might face challenges from those who oppose his new - found status and powers, while also trying to uncover the secrets of his past life as Lord Emrys.
One possible plotline could be that Harry discovers Snape's past and the reasons behind his harsh behavior. For example, Harry might find out about Snape's love for his mother. This new understanding could lead to an initial truce between them. They could start by working together on a difficult potion in the classroom, with Harry being more patient and Snape being less critical. As time passes, they might find themselves sharing their thoughts about the wizarding world's future and realizing they have more in common than they thought.
One possible plotline could be Naruto being exposed to some sort of dark jutsu that warps his mind and makes him idolize Tobi. He might start to adopt Tobi's methods and goals, causing chaos in the ninja world. His friends would be shocked and try to bring him back to his senses.
One possible plotline could be that Naruto is cursed by a powerful dark jutsu during a battle. This jutsu slowly transforms him into a demon. As he changes, his friends initially try to find a way to reverse it. But Naruto starts to gain new powers that he must learn to control, and he has to struggle between his human side and the emerging demon nature.