One possible storyline could be that Snape sees Neville's potential which has been overlooked. He decides to take Neville under his wing to train him in potions and other areas of magic. Snape, with his strict yet effective teaching methods, could help Neville gain confidence. Neville might start to thrive under Snape's guidance, learning advanced spells and techniques. This could also lead to a change in their relationship dynamic within Hogwarts, with Neville no longer fearing Snape but instead respecting him as a mentor.
It could be an orphaned wizard child from a family that was killed by Death Eaters. This would give Snape an added sense of responsibility as he might feel guilty for being associated with the Death Eaters in the past.
One common theme is redemption. Snape, with his complex past, often finds a form of redemption through his relationship with Neville. Another theme is growth. Neville, who is often underestimated, grows in confidence and power with Snape's influence. Also, there's the theme of unlikely friendship turning into something deeper.
Snape's character often develops from a cold and aloof figure to a more caring and nurturing one. At first, he might be hesitant and gruff, but as he spends more time with Harry, his protective instincts kick in. He starts to show more patience and understanding, which is a big change from his usual self in the original series.
One possible plot could be that Snape, seeing Draco's vulnerability after the fall of the Malfoy family in the wizarding war, decides to take him in. Snape would then have to deal with Draco's emotional baggage and his own complex feelings towards the boy. He might try to teach Draco a different set of values than what he was brought up with in the Malfoy household.
Well, perhaps the plot could involve Snape finding an orphaned child in the wizarding world. He might initially be hesitant but then grow attached as he sees the child's potential. The story could also include Snape teaching the child magic, protecting the child from dark forces, and the two of them forming a unique bond that changes Snape's cold exterior over time.
In the fanfiction, their relationship would be complex at the start. Snape, having his own demons and secrets, would be a bit of an enigma to Draco. Draco, on the other hand, would be dealing with the loss of his family's status. Snape would start by providing a stable home for Draco. As they interact more, Draco would notice Snape's small acts of kindness. Snape would encourage Draco to explore his own identity outside of the Malfoy name. This would lead to a closer relationship, with Snape teaching Draco about things like loyalty, sacrifice, and the true nature of magic, and Draco in turn bringing out a more human side of Snape.
Snape would likely become more nurturing. Instead of just being the strict and often cold Potions master, he would have to show a softer side to take care of Harry. He might be more patient as he guides Harry through his magical education and daily life.
Well, it often starts with a lot of misunderstandings. Snape has his own preconceived notions about Hermione as a Gryffindor student, and Hermione has her own view of Snape as a strict and often unfair teacher. However, as they live together, small moments start to change their relationship. For example, when Hermione is having trouble with a particularly difficult spell, Snape doesn't scold her but instead patiently guides her. This gradually builds trust between them, and they form a unique bond that is different from the typical student - teacher relationship or even a normal father - daughter relationship.
Snape would become more nurturing. He's used to being cold and distant, but with a baby to care for, he'd have to soften. For example, he'd learn to comfort Hermione when she cries.