Snape's loyalty might shift or expand. Originally, his loyalty was mainly to himself and later to Dumbledore. But in fanfictions where he's part of the Marauders, he may develop a new loyalty to this group. This could lead to him being more involved in their antics and causes, and he might even start to protect them in ways he never thought he would, changing his overall character arc from a solitary figure to a more group - oriented one.
Snape's character often becomes more open - minded. In many such fanfictions, being around the Marauders, who are generally more carefree and adventurous, forces Snape out of his shell. He starts to see things from different perspectives, rather than just being the brooding loner he was originally.
In these fanfictions, Snape often becomes more self - reflective. He starts to realize the full extent of his actions and how they've affected others. For example, he might come to see how his treatment of Harry was unfair. He also becomes more open about his emotions, which was something he always hid before.
Snape's character changes in his relationship with others too. He becomes more involved with the Hogwarts community as he is now responsible for Harry. He might start to collaborate more with other teachers, like McGonagall, who he previously had a rather cold relationship with. His attitude towards the students also changes as he realizes that they are just kids trying to find their way, much like Harry. This is a big shift from his usual strict and often unforgiving self.
In terms of appearance, a female Snape would look different, of course. But more importantly, her self - confidence might be presented in a different way. A female Snape could use her appearance and charm in a way that the male Snape never did, to manipulate situations or gain allies, which would be a significant change from the original character.
Snape's character could become more calculating and cold - hearted. Tom Riddle is not exactly a nurturing figure, and being raised by him would expose Snape to a world of power - seeking and self - interest. Snape may lose some of his capacity for love and affection that he had for Lily in the original story. He would be more focused on achieving power and status within Riddle's regime. His relationships with other characters would be more transactional. For instance, he would not form the same kind of complex relationship with Narcissa Malfoy as he did in the original story because his priorities would be different, being centered around Riddle's goals rather than his own personal loyalties and emotions.
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.
Snape might become more confident. As a king, he would have to take charge and make decisions without hesitation. His usual brooding and self - doubting nature might be replaced by a more assertive and commanding personality. He would also likely be more protective of his 'kingdom' or those under his rule, which could show a more noble side of his character.
One great 'Severus Snape is a Marauder' fanfiction is 'The Marauder's Snape'. It explores an alternate universe where Snape somehow becomes part of the Marauders' group in their Hogwarts days. The story delves into the complex relationships that would form, especially between Snape and James Potter. It's full of interesting character dynamics and some really well - written dialogue.
Snape's personality would likely soften. He'd have to be more patient and understanding. Instead of just being the strict and often sarcastic Potions master, he'd become more nurturing. He'd still have his sharp edges, but around Harry, he'd show more kindness and care as he takes on the role of a guardian.
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.
In this fanfiction, Severus Snape's character is likely to be explored in depth. His 'heart' could refer to his hidden emotions, his capacity for love or loyalty that was often masked in the original series. It might show his softer side that was rarely seen, perhaps in his relationships with other characters like Harry or Lily.