The plot could start with Harry having a vision or a strange encounter that makes him suspect his parentage is not what he thought. As he digs deeper, he finds evidence that links him to Rabastan Lestrange. This revelation causes chaos in the wizarding world. Harry has to deal with the fact that his family is associated with the Dark Arts. He might be forced to choose between the values he has grown up with and the new identity he has discovered. He could also find himself in the middle of a power struggle between different wizarding factions who have different views on his new status.
A plot might revolve around the wizarding community's reaction to Harry's new identity. Some might fear that he has the same dark tendencies as the Lestrange family. This could lead to Harry being ostracized at Hogwarts. Meanwhile, he might start to notice some strange powers or abilities within himself that he can't explain. He then tries to find out if these are related to his Lestrange heritage. Along the way, he forms new alliances with some unlikely characters who are also interested in the secrets of his family.
One possible plot could be that it's an alternate universe where the war ended differently. Harry, in his quest for peace and to end the cycle of hatred, decides to marry Rabastan Lestrange as a political move. He hopes to reform the pure - blood supremacist ideas within the Lestrange family. They might start off as strangers, but gradually learn about each other's pasts and find common ground in their losses. Harry could use his influence to bring Rabastan into the light side, and together they could work towards rebuilding the wizarding world in a more inclusive way.
The idea of Harry Potter being the son of Rabastan Lestrange in fanfiction is quite wild. It would likely involve a lot of changes to the original plot. For example, his time at Hogwarts could be full of challenges as he tries to fit in while also dealing with the stigma of his new family. His skills in magic might develop in a different way too. He could have a natural inclination towards the Dark Arts, which he would have to struggle with. And the way the story would handle his relationship with Voldemort would be very different, perhaps even more complex.
One plot idea could be that Rabastan, in an alternate universe, is forced to team up with Harry Potter to fight a common dark magic threat that endangers both the wizarding world and the Death Eaters' own interests. This would create a lot of tension as they have to overcome their natural enmity.
A major theme is the exploration of his character's complexity. Instead of just being a villain, fanfictions try to show his different sides. His past traumas or the reasons he got involved with the Death Eaters in the first place. There's also the theme of survival in a post - war wizarding world, where he has to deal with the consequences of his actions and find a way to exist.
The theme of secrecy and hidden knowledge is prevalent too. Rabastan might know secrets about the Death Eaters or the wizarding world in general. Fanfictions play with this idea, showing Harry or other characters trying to uncover these secrets from Rabastan. It creates a sense of mystery and suspense throughout the story, making it engaging for the readers.
One common theme is redemption. Malfoy, especially, is often a character who is explored in terms of his potential for redemption. He may have been on the wrong side during the main series, but in fanfiction, he can find a way to make up for his past mistakes. Another theme is the exploration of the dark side. Rabastan Lestrange was a Death Eater, and fanfictions may delve into his motives and the allure of the dark magic he practiced.
One common theme is redemption. Since Rabastan is often portrayed as a Death Eater, many fanfictions explore his journey towards redemption through his relationship. Another theme is the exploration of the dark side of the wizarding world. His character is associated with the dark arts, so the fanfictions often dive into that aspect.
Rabastan Lestrange is a rather dark and complex character in the Harry Potter universe. In fanfic, he can be explored in various ways. He was a Death Eater, which means his actions were often cruel and in line with Voldemort's evil plans. Some fanfics might focus on his time in Azkaban and how that changed him, or they could explore his relationships within the Death Eater ranks, such as with his brother Rodolphus. His loyalty to Voldemort is also a key aspect that could be delved into in fanfic.
He's often portrayed as a menacing figure. Since he was a Death Eater, he's usually shown as being loyal to Voldemort's cause. In many fanfics, he's involved in dark magic and evil schemes.
One great fanfiction could be about how Malfoy and Rabastan Lestrange interact in the post - Voldemort era. Maybe they both have to face the consequences of their actions during the war. They might encounter Harry Potter who is now trying to reform the wizarding world. Another idea could be a story set during the time of the first wizarding war where they all cross paths in a dangerous mission.