In these fanfictions, Severus often develops a more nurturing side. Since he has Harry as a pet, he has to take on a caretaker role, which is different from his usual strict and aloof self. He might become more patient as he guides Harry through various situations.
Often, Severus in these stories develops a new understanding of love and friendship. His relationship with Harry as master and pet blurs the lines between his traditional views. He starts to see Harry not just as a student or the son of his old rival, but as someone he truly cares about on a more personal level. This development can be shown through his actions, like sharing his deepest secrets with Harry or going out of his way to make Harry happy.
Severus' character often develops from a cold and aloof figure to a more caring and nurturing one. He starts to open up his heart as he takes on the role of raising Harry. His sense of protectiveness grows, and he becomes more patient, which is a big change from his usual self in the original series.
At first, it's likely to be full of tension. Harry may be hesitant and even a bit resentful about the marriage, while Severus is his usual cold self. But as time passes, they start to see each other's good sides. Harry realizes Severus's intelligence and Severus sees Harry's courage in a new light.
In the fan fiction, Severus could start to develop a sense of responsibility towards Harry. At first, he may have saved Harry out of a sense of duty to Lily Potter, but as time goes on, he realizes that Harry has his own worth. This could make him more open to forming a bond with Harry, which is a huge change for his character who has been so closed - off for so long. He may also start to question some of his long - held beliefs about the Gryffindors, especially as he sees Harry's courage in the face of his difficult upbringing at the Dursleys.
Severus might start off as just fulfilling a sense of duty. He has always been a complex character. But as he saves Harry from the Dursleys, he begins to see Harry in a new light. He realizes that Harry is not just James Potter's son but an individual with his own struggles. This could lead to him becoming more empathetic towards Harry, gradually shedding some of his cold exterior.
His character could also develop in terms of loyalty. At first, he might be rescuing Harry for some self - serving reasons, like to gain favor with Dumbledore or to stop a threat to the wizarding world that he discovers is related to the Dursleys. But as he spends time with Harry, he could develop a genuine loyalty towards the boy, which is a big shift from his previous animosity.
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.
His character might develop a new sense of perspective. As a ghost, he is detached from the physical world and can view his past actions more objectively. He could realize the full extent of his mistakes and the good he had also done. For example, he might see how his actions towards Harry were sometimes driven by his own past traumas rather than pure malice.
In many of these fanfictions, Severus becomes more empathetic. For example, in 'A Different Destiny', when he finds baby Harry, he starts to see the potential for a different future for the boy, which makes him less bitter and more open - minded.
In this scenario, Severus' character experiences a significant transformation. He has to shed his cold exterior to a large extent. He becomes a father figure, which means he has to be there for the boys emotionally. He starts to show emotions more openly, whether it's pride when they do well in their studies or worry when they are in danger. His sense of loyalty also shifts. Before, it was mainly towards certain people or causes, but now his loyalty is first and foremost to Harry and Draco. This new - found loyalty makes him a more rounded and likable character in the fanfiction, as he is no longer just the brooding potions master but a loving and dedicated father.
Harry might develop from being resistant to the marriage to being more open - minded. He realizes that Severus is not just the strict teacher he once thought. For Severus, he may start to soften his tough exterior. He begins to see Harry not as James Potter's son but as an individual with his own merits.