Another plot point might be the discovery of a shared secret or goal between Snape and Harry. This could bring them closer together and change the dynamic of their relationship. For example, they might both be trying to uncover a mystery in the wizarding world that requires their combined efforts.
A significant plot point could also be the development of a new friendship or mentorship between Snape and Harry. As Snape stops hating Harry, he could start teaching Harry new spells or sharing his knowledge of the dark arts in a more positive way, which would be a major shift from their previous relationship.
One key plot point could be the moment when Snape first shows a sign of not hating Harry. Maybe it's during a dangerous situation where Snape protects Harry instead of being cold towards him.
One possible reason could be that in the fanfic, Snape realizes Harry has more of Lily in him than he initially thought. Harry might show kindness or a particular trait that reminds Snape of Lily, softening his feelings.
The plot might start with Snape realizing that Harry is in need of a proper family. So he decides to adopt him. As the story progresses, they would need to adjust to living together. Snape would have to change his living quarters to accommodate Harry. There could be a lot of emotional moments like when Snape tells Harry stories about his mother. Also, the fanfic could explore how Snape helps Harry deal with his fame in a different way than the Dursleys did. He could teach Harry to be more humble and use his fame for good in the wizarding community.
It re - imagines their relationship as more of an understanding one. Instead of the constant hostility, they might start to have moments of mutual respect.
One possible reason could be that in the fanfiction, the author might explore Snape's complex past with Harry's mother, Lily. Snape's love for Lily could translate into a more nuanced view of Harry. He may see parts of Lily in Harry and that softens his hatred.
One key plot point could be the revelation that Snape is in some sort of danger that only Harry's sacrifice can prevent. Maybe it's a curse placed on Snape by Voldemort that can only be broken if Harry gives his life. Another point could be Harry's decision - making process. He would have to grapple with leaving his loved ones behind. And finally, the moment of sacrifice itself, which could be a very emotional and magical scene.
In some versions of 'harry becomes an obscurus fanfic', the key plot could be Harry's journey to master the Obscurus power. He might start out as an outcast because of it, but then discovers that it can be a weapon against the real threats in the wizarding world. His relationship with Dumbledore or other authority figures might change as they try to help or restrain him. And there could be a big showdown where he has to decide whether to fully embrace or reject the Obscurus within.
In a 'harry saves everyone fanfic', one key plot point could be Harry discovering a new, hidden power within himself. This power might be the key to saving everyone. He could also form new alliances with unlikely characters. For example, he might team up with some Slytherins who have a change of heart. Another aspect could be that the situation is extremely dire, like the whole wizarding world is on the verge of destruction. Harry then has to go on a quest to find ancient magic or artifacts that can turn the tide and save all the wizards and witches from harm.
One common plot point is the initial resistance from both sides. Snape, with his pride and past grievances against Harry's father, would be hesitant. Harry, on the other hand, would be confused by the whole idea. Another is the discovery of new sides of each other. As they spend time together, they start to see qualities in one another that they never noticed before. And there's often the external opposition from the wizarding community who might not accept such an unusual pairing.
Maybe the fanfiction focuses on Harry exploring new magical abilities that come with not using a wand. He could discover that he has a unique way of flying without a broomstick, or he can communicate with magical plants in a way that was previously thought impossible. These new abilities would add a whole new dimension to the story.
One possibility could be that he discovers a different magical school. Maybe there's a hidden school in the Muggle world that he stumbles upon. It could have its own unique curriculum and culture. He might make new friends there and learn magic in a completely different way compared to how it's taught at Hogwarts.