One interesting plot could be Severus having to deal with Harry's fame at Hogwarts while trying to keep their new family relationship a secret. It adds a layer of mystery and tension.
Well, one interesting plot could be Harry seeing Severus in a new light. He realizes that Severus was actually a complex and misunderstood character. So, he decides to adopt him to give him a new start in life. Another plot might involve Severus initially being resistant to the idea of being adopted by Harry, but over time, he warms up to the concept as he sees Harry's genuine kindness.
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.
One interesting plot could be Severus initially struggling to connect with Harry due to their past differences. But as he gets to know the extent of Harry's abuse, he becomes fiercely protective. He starts teaching Harry advanced magic privately, which helps Harry grow both in confidence and power.
Another plot might involve Harry adopting Ginny to keep her safe from a powerful and secretive magical organization that has its eyes on her for some reason. Harry has to hide her identity and train her in advanced magic in order to keep her out of their reach. As they go through this process, their relationship evolves into a unique family - like bond filled with mutual respect and love.
His personality also becomes more open. He has to communicate with Harry in a more honest and open way. He can't keep all his thoughts and feelings bottled up like he used to. He has to share his wisdom and experiences with Harry, which in turn makes him more approachable and less of the brooding, closed - off person he was before in the official story.
The two main characters are obviously Harry and Severus. Harry, the hero of the wizarding world, who has a big heart and a sense of justice. And Severus, the complex and often misunderstood former Death Eater and potions master.
Severus would likely become more protective. His personality would shift from being mainly focused on his own grudges and potions work to being centered around Harry's well - being. He might also become a bit more open - minded as he has to consider Harry's needs and wants, which could be different from his own. For instance, he may have to tolerate Harry's love for flying, even though he himself may not be into it. And over time, he might develop a sense of humor as he deals with Harry's childish antics.
He would become more nurturing. Usually, Severus is seen as cold and aloof, but with Harry in his care, he'd have to show more warmth. He might still be strict, but it would be out of love for Harry's well - being rather than just being his usual harsh self.
One interesting plot could be Harry helping Fred and George start a new, even more successful business. He might use his fame and fortune to back them up. Another could be Harry teaching them advanced magic he learned from his adventures. It would be really cool to see how they incorporate that into their pranks and inventions.
In some 'Batman Adopts Harry Potter' fanfictions, a great plot is when Batman tries to enroll Harry in a normal school in Gotham. Harry has to adapt to a non - magical educational system while also hiding his wizarding past. At the same time, Batman is trying to protect Harry from any threats that might come from the wizarding world, like Death Eaters or Voldemort's followers who might want to harm the Boy Who Lived.