Well, a possible plot is that Harry discovers his true parentage in a very dramatic way. He could be in the middle of a battle or a difficult situation at Hogwarts and suddenly realize that Snape and Bellatrix are his parents. This would completely change his perception of himself and his place in the wizarding world. He might then have to deal with the consequences of this revelation, such as how the Order of the Phoenix and the Death Eaters view him.
In some fanfictions, the plot could revolve around Harry's magical abilities being a unique blend due to his parentage. He might have an uncanny ability with both light and dark magic. For example, he could be able to use some of Bellatrix's powerful dark spells in a way that is not completely evil, perhaps to defend against greater threats. His relationship with Dumbledore could also be very different. Dumbledore might be more cautious or more intrigued by Harry, depending on how he views the combination of Snape and Bellatrix's genes in Harry.
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.
Yes, there are some fanfictions with such a wild and unorthodox concept. However, this goes completely against the original 'Harry Potter' canon which clearly states Harry's parents are James Potter and Lily Evans. In fanfiction, writers often like to explore 'what - if' scenarios that are far from the original story line, just for the sake of creativity and exploring different character dynamics.
Harry in this fanfiction might be a lot more complex. His identity is no longer that of the Boy Who Lived in the traditional sense. He has to come to terms with the fact that his parents are two very different and controversial figures. He may become more of an outcast, even among his friends at Hogwarts. His sense of right and wrong could be more blurred, as he has the influence of Bellatrix's dark ways and Snape's own morally ambiguous actions. He might be constantly questioning his own nature and whether he is destined to follow a path of good or evil.
One possible interesting plot could be Snape having to follow Harry Potter's lead in a dangerous mission. Maybe they are in a situation where Snape has no choice but to trust Harry completely, which is a big change from their usual relationship in the original books.
Perhaps in the fanfiction, Snape assigns Harry to clean all the old potion vials in the storage room during detention. While doing so, Harry discovers an old diary that seems to hold secrets about Snape's past at Hogwarts, which then leads to a series of revelations and a change in their relationship.
One interesting plot could be Harry growing up with Snape's strict but ultimately caring guidance. Snape might teach Harry potions from a very young age, and Harry could develop a different kind of magic skill set compared to canon. Another plot could involve Harry having to deal with the Slytherin side of the wizarding world earlier, as Snape has strong Slytherin ties. Also, the relationship between Harry and Snape could be a complex mix of father - son dynamic and teacher - student relationship, which would be really fascinating to explore.
Perhaps a plotline where Harry discovers the truth about his parentage later in life. He has been raised believing Bellatrix is his mother, but then uncovers evidence that it's all a complex web of dark magic and deception. This could lead to a journey of self - discovery as he tries to figure out who he really is and where he belongs in the wizarding world, all while dealing with the stigma of being associated with Bellatrix Lestrange.
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.
Yes, there are some fanfictions with this rather out - of - the - ordinary concept. Fanfiction often explores creative and non - canon ideas, and this is one such example.
Yes, there are likely some fanfictions out there with this rather out - of - the - box concept. Fanfiction writers often come up with very creative and sometimes wild ideas. They might explore how such a relationship could change the entire Harry Potter story, from Harry's upbringing in a Death Eater - influenced environment to how it would impact his relationships with other characters like Dumbledore or Hermione.