Lucius Malfoy would be an interesting choice. As a prominent pureblood figure, he could interact with Snape in various ways. They could have different views on pureblood supremacy, which would create tension and drama. Maybe Lucius tries to persuade Snape to fully embrace the pureblood ideology, but Snape resists.
Narcissa Malfoy could also work well. She is a pureblood and her loyalty to her family and the pureblood way of life could be explored. She might approach Snape for some reason, perhaps asking for his help in a matter related to the pureblood society. This could lead to a web of secrets and alliances within the story.
Lily Evans could be a great supporting character. Even though she's a Muggle - born, her relationship with Snape is complex and could add depth to the pureblood fanfiction. Her presence could also show the contrast between the pureblood and non - pureblood worlds.
One idea could be exploring Snape's family history as a pureblood. Maybe he discovers a long - lost family secret that has been hidden for generations. Another could be a story where Snape has to navigate the pureblood society's expectations while still being true to his own beliefs and loyalties.
Well, Harry Potter would likely still be a main character. His relationship with Snape could be even more complex in this fanfiction. Since Snape is a demigod, Harry might be both in awe and a bit scared of him at times.
Luna Lovegood could be an interesting love interest. She has an open - minded and eccentric nature. Her ability to see the good in people, even those like Snape who seem cold on the surface, could draw them together. She might be able to make Snape appreciate the beauty in the world in a way he never has before.
Bellatrix Lestrange could also be a character who interacts with Snape. If Snape goes back far enough, he might try to influence Bellatrix's path and keep her from becoming such a devoted Death Eater. This could have a major impact on Voldemort's power and the overall balance of the wizarding world.
Luna Lovegood could be an interesting choice. Her unique and somewhat eccentric personality could complement Snape's brooding nature. She might see through his tough exterior and find the good in him, and their relationship could be based on mutual understanding of the 'outsider' status they both have in different ways.
Lily Potter is a very common character paired with Snape in these fanfictions. After all, his love for her was a major part of his character in the original series. Another one could be an original character created by the fanfiction author. This allows for more creative freedom in crafting the love story.
The other Death Eaters could be antagonists. They might not trust Snape completely and try to undermine him. For example, Bellatrix Lestrange could suspect Snape's loyalty to Voldemort and try to expose him while he's alone, which would put him in a very dangerous situation.
Obviously, Severus Snape himself is a central character. Harry Potter often appears as well, since Snape's story is so intertwined with his. Hermione Granger might also be there, as she is interested in knowledge and could interact with Snape in different ways. Dumbledore is another common character. He was Snape's mentor and ally, so in these fanfictions, he could play an important role in guiding the reincarnated Snape or interacting with the new character in Snape's body. And of course, Lily Evans, Snape's long - lost love, is likely to be a part of the story, whether in flashbacks or in some new interactions.
Lily Evans is often paired with Snape in these fanfictions. Their relationship was so central to his character in the original story, and in a second - chance scenario, many writers explore the possibility of them having a different outcome. Another common pairing is with Hermione Granger. Hermione's intelligence and strong will could make for an interesting dynamic with Snape, especially as she might help him in his second - chance journey.
Hermione could be a main supporting character. She might offer her wisdom and support to Harry, helping him come to terms with the marriage contract. Also, she could act as a mediator between Harry and Severus at times.