She could be brooding like Snape. Since she's his niece, she might have inherited that moody and introspective nature. For example, she could often be found alone in the library, lost in her thoughts.
She could be highly intelligent and cunning. Just like her uncle, she may have a sharp mind for magic, especially in areas like potions and the Dark Arts. However, she could also use her intelligence in more positive ways, like finding solutions to problems that the wizarding world faces during difficult times.
In this OC fanfiction, Snape's husband could have a strong sense of justice. This would be important as Snape has also been involved in battles between good and evil. He might be creative, coming up with unique solutions to problems that Snape might face. His personality could also be one of perseverance. Given that Snape has a complex and often difficult life, his husband would need to persevere through tough times with him. And he could be a bit of a free spirit, adding some lightness to Snape's rather serious and often dark world.
One interesting fanfiction could be where Severus Snape's niece arrives at Hogwarts. She might be a bit of an outcast like her uncle was. In this fic, she could discover a hidden talent for potions, much like Snape, and face the challenges of living in the shadow of her famous uncle. Maybe she has to prove herself to her peers and teachers that she's not just 'Snape's niece' but her own person with unique skills.
One common trait is his increased strength. This could make him an even more formidable opponent or a more effective protector, depending on the plot of the fanfiction. His diet of blood might also be a point of interest. Some fanfictions might explore how he obtains blood in a world where vampires are not common knowledge. It could be a source of internal conflict for him, especially if he has moral objections to harming others to get it. His immortality, if it comes with being a vampire in the fanfiction, could also play a role in his long - term plans and his view of the wizarding world.
He might inherit Snape's intelligence. Snape was highly intelligent, especially in potions and the Dark Arts. His son could also show a great aptitude for these areas of study. Just like Snape, he could be a quick thinker and able to solve complex problems.
In fanfiction, Severus Snape's boggart could be the lifeless body of Lily Potter. Since he loved her deeply and her death was a great tragedy for him. It would represent his ultimate fear of losing her all over again, even in the form of a boggart.
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 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.
Perhaps she is very determined. If she decides to break away from her mother's shadow and the world of the Death Eaters, she would need to be. She would face many obstacles, including the wrath of her mother and the other Death Eaters. But her determination could drive her to seek a new life, maybe even one where she helps to reform the wizarding world's view on things like blood purity and the use of dark magic.
She could be rebellious. Tired of her mother's dark ways, she might rebel against the pure - blood supremacist ideology Bellatrix adhered to. For example, she could befriend Muggle - borns openly.
As a wolf Animagus, Snape might be more in touch with his primal instincts. His usual guarded and calculating personality could be tempered by the wild nature of the wolf. He may be more impulsive in his actions, acting on instinct rather than over - thinking every move like he does in his human form.