One interesting plot could be Snape raising Harry while secretly training him in advanced potions and dark arts defenses. Harry would grow up with a different perspective on Snape, seeing him as a strict but caring father figure. Another plot might involve Snape having to protect Harry from other dark wizards who suspect Harry's true potential. This could lead to some intense magical battles and Snape using his knowledge and skills to keep Harry safe.
In some fanfictions, Snape raising Harry leads to a change in Harry's personality. Since Snape is a strict disciplinarian, Harry becomes more studious and less impulsive. The story could explore how this new Harry fares in the wizarding world. For example, he might be more respected by his peers at Hogwarts because of his increased knowledge and maturity. Also, Snape might teach Harry some of his own spells and techniques that are not part of the regular Hogwarts curriculum, giving Harry an edge in magical duels.
A really unique plot could be Snape adopting Harry during a time when Voldemort is still a threat. Snape has to balance protecting Harry from Voldemort's followers and also from the prejudice within the wizarding community. He might train Harry in Occlumency more intensively, and in the process, they develop a deeper understanding of each other. Harry starts to see Snape not as the mean professor but as a complex person with his own traumas and reasons for his actions.
Some unique plots include a fanfic where Snape and Harry are magically bonded and can feel each other's emotions. There's also a story where Snape is turned into a cat and only Harry can understand him, leading to some really interesting interactions. A different one is a fanfiction where Harry discovers that Snape was actually protecting him all along in a much more elaborate and secret way than in the original books, and they have to team up to expose a greater conspiracy within the wizarding world.
One plot could be that Snape, under some dark magic influence, forces Harry to accompany him on a dangerous mission to retrieve a lost magical artifact. Snape believes Harry has some hidden power that can help. Another could be Snape forcing Harry to study a very advanced and dangerous form of magic, thinking it will protect Harry in the long run. And there could also be a plot where Snape forces Harry to enter a magically sealed area to face some long - forgotten threat that only Harry can potentially defeat.
A common plot is the 'what - if' scenario. For example, what if Snape had confessed his love to Lily before she chose James? This often leads to alternate timelines where Snape and Lily end up together, and the whole story of Harry Potter changes. Another plot is the secret relationship plot, where Snape has a hidden relationship with someone (could be an OC or another character) that is related to his unrequited love for Lily.
The plot could take a really interesting turn when it comes to Voldemort. Since Snape is raising Harry, he might train Harry in a way that Voldemort doesn't expect. Maybe Harry would be more of a spy in the dark side's camp. Snape could also use his position to mislead Voldemort about Harry's true abilities and intentions. This would create a whole new set of challenges and power dynamics in the fight against the Dark Lord. Harry's loyalties would be constantly tested, and his relationship with Snape would be even more crucial to the story.
One interesting plot could be that Snape secretly follows Harry during a dangerous wizarding tournament task and intervenes when a dark creature is about to attack Harry without revealing his identity. This would add a layer of mystery and show Snape's hidden care for Harry.
One interesting fanfiction could be about Snape secretly mentoring Harry outside of Hogwarts. In this story, Snape realizes the importance of Harry's role in the wizarding world and decides to give him extra training in potions and defense against the dark arts without Dumbledore's knowledge. It shows a different side of their relationship, less adversarial and more collaborative.
There are fanfictions that focus on Snape's role in the wizarding war from a different perspective. For example, how he secretly influenced certain events to protect Harry without anyone really knowing. He could have been involved in undercover operations that are not mentioned in the original books.
Well, perhaps a plot where Harry has to defend the bears from dark wizards who want to harm them for some reason. Since he was raised by bears, he would have a deep connection with them and would do anything to protect them. He might use his unique knowledge of the forest, gained from living with the bears, to outwit the dark wizards.
Perhaps in this fanfiction, the scorpion - raised Harry has a very different relationship with Hogwarts. He might be more of an outcast due to his strange upbringing, and has to fight harder to prove himself worthy of being at the school. His knowledge of the wizarding world might be different too, as the scorpion may have taught him some unorthodox ways of using magic.