One possibility could be Rodolphus Lestrange, her husband in the wizarding world. It would be a traditional choice and could explore how their relationship evolves during the pregnancy. Another option could be Voldemort himself. It would be a very dark and twisted scenario, but it would add a lot of drama to the story.
It could also be a Muggle that Bellatrix had an encounter with during one of her missions. This would be a very unexpected and controversial choice, as Bellatrix is a pure - blood supremacist. But it would make for a very interesting exploration of her character and how she deals with such a situation.
Perhaps it could be a character we don't know much about yet, like a secret admirer among the Death Eaters. He could have been in love with Bellatrix from afar and somehow managed to get her pregnant. This would introduce a new and mysterious element to the fanfiction.
It could be Voldemort himself. Given her extreme loyalty to him, it's not a far - fetched idea that there could be some sort of connection between them that led to her pregnancy.
Voldemort is often paired with Bellatrix in fanfiction. Their relationship in the original series was one of master and servant, but in fanfiction, it can be explored in more complex and romantic ways. Another character often paired with her is Narcissa. Their sisterly bond can be a central focus, or it can be twisted into something more sinister or complex in fan - created stories. Also, sometimes Sirius Black is paired with her in alternate universe stories, given their family connection and the contrast in their loyalties.
A plot could focus on the relationship between Bellatrix and the father of the child. If it's a fellow Death Eater, how does their dynamic change? Do they become more protective of each other? Or perhaps the father is an unexpected character, like a wizard who was undercover among the Death Eaters. This would add a whole new layer of mystery and drama to the fanfiction.
A major plot twist could be that the father of the child is a secret enemy spy. This would add a whole new layer of drama as Bellatrix's daughter has to deal with the betrayal and also protect her child from both sides. Another could be that the pregnancy is part of a magical prophecy that she was unaware of, and it has far - reaching consequences for the wizarding world.
The author 'ShadowFictionist' also does a wonderful job. Their Bellatrix Lestrange fanfictions often involve complex plots that revolve around her relationship with other characters in the Harry Potter universe, such as her interactions with Severus Snape.
There might be a fanfic titled 'A New Beginning for Bellatrix's Daughter'. In this, her pregnancy could be a symbol of hope in a rather dark and chaotic wizarding world. It could show her journey of self - discovery as she becomes a mother, breaking away from the shadow of her infamous mother.
The plot could involve the son trying to redeem his mother's name. He might go on a journey to find out more about her past, hoping to understand why she became so evil. Along the way, he meets various characters who knew his mother and has to deal with their mixed reactions towards him.
Fanfiction often takes creative liberties. So, the relationship between Bellatrix Lestrange's daughter and Hermione could be full of twists and turns. For instance, the daughter could be a double agent, pretending to be on the dark side but actually helping Hermione and her friends. This could add a layer of mystery and intrigue to the story. Hermione's character, with her quick thinking and determination, would play a crucial role in this complex relationship, either trusting or being skeptical of the daughter's true motives.
In a Harry Potter fanfiction where Bellatrix Lestrange joins, she could be a major source of conflict. She's extremely skilled in the Dark Arts. Her addition to the story might see her influencing the plot in ways that are both unpredictable and dangerous. For instance, she could manipulate other characters, especially those on the darker side of the wizarding world. She might also introduce new magical elements or artifacts that are related to the Dark Arts. Her character is so complex and unpredictable that she could either be a pure antagonist or, in a more creative take, have a change of heart and become an anti - hero, but this would require a very well - written and thought - out plot.
It could be Bellatrix Lestrange's younger sister who was not as involved in the dark arts as Bellatrix. She might be a character who was forced into the shadows because of her family name but has a good heart. Harry's betrothal to her could be a way to redeem the Lestrange name in the eyes of the wizarding world.