Snape would likely become more confident in his place at Hogwarts. As the heir, he has a new - found sense of belonging that could soften his harsh exterior. He might be more open to helping students, especially those who show an interest in the history of Hogwarts.
Snape's character could become more complex. He might start to incorporate some of Merlin's wisdom into his own actions. For example, Merlin was known for his ability to see the good in people, and Snape could start to do the same. Instead of just being bitter and resentful towards Harry, he could start to see Harry as a potential ally in a greater fight, much like Merlin saw the potential in the young knights of Camelot.
Snape's character might develop more positively. Without the burden of his past mistakes and betrayals haunting him, he could be more confident. He might be more open to forming friendships, especially with Dumbledore. Their relationship could start on a more equal footing, leading to a more trusting bond.
In some fanfictions, Severus Snape's character develops by becoming more open - minded towards Muggles. He might start off with his typical wizarding - world prejudices, but through various interactions, he begins to see Muggles in a new light. For example, he could meet a Muggle scientist whose thirst for knowledge reminds him of his own love for potions, and this changes his view.
Hermione would likely become more nurturing. She's used to being the know - it - all student, but raising Snape would force her to be more empathetic and patient. Her development would involve learning to deal with a child's emotions and insecurities, which would make her a more well - rounded character.
Snape's character development in these fanfictions is quite interesting. At first, he might be helping Harry out of a sense of obligation to Lily. But as time goes on, he starts to form a unique bond with Harry. His interactions with Harry force him to confront his own prejudices and grudges. He becomes more empathetic towards Harry's situation, which is a big change from his initial coldness. For example, in some stories, he begins to understand Harry's loneliness and tries to offer some form of companionship, which is a huge step for a character like Snape.
In these fanfictions, Snape's character often develops from a seemingly cold and unfeeling person to someone with more depth. When he saves Harry, it starts to chip away at his facade. For example, he might initially save Harry out of obligation but as time goes on, he realizes he has a genuine care for the boy. This is different from his canon behavior where his feelings are mostly hidden.
Her character could develop through her relationships. She might befriend students from all houses, which is a bit unusual in Hogwarts. This would be because she has qualities from both Gryffindor (from Hermione) and Slytherin (from Snape). Through these friendships, she'd learn different perspectives and grow as a person. For instance, she could teach her Gryffindor friends about the subtleties of Slytherin thinking and vice versa.
His character might develop more of a social side. As a bartender, he has to interact with various people, so he could become more approachable. For instance, he might start to crack a rare smile or two when chatting with regular customers.
Snape's character may develop in a way that shows his loyalty to Dumbledore and the greater good in a more obvious way. Saving Harry from Umbridge, who represents the Ministry's overreach and corruption, could be seen as Snape firmly taking a stand on the side of what's right. It could also make him more conflicted internally as he has to balance his role as a double - agent and this new - found 'protector' role of Harry, which in turn would add more depth to his already complex character.
An interesting plot might be Snape's journey to fully understand what it means to be the heir of Hogwarts. He could start having strange dreams or visions related to the founders of Hogwarts. As he delves deeper, he uncovers secrets about the school's past that not only change his view of Hogwarts but also of himself. This new knowledge could also impact his relationships with the students and other teachers, as he realizes he has a greater responsibility towards the school than he initially thought.