Dumbledore is also a character often paired with Snape in such fanfictions. Snape's loyalty to Dumbledore in the original story is complex. When he travels back, their relationship could be rewritten. Snape might confide in Dumbledore about his time - traveling experiences and they could work together more closely to prevent future disasters. Additionally, James Potter could be paired with Snape in a sense that Snape tries to change their relationship dynamic by going back in time, either to befriend him or to avoid the conflicts they had in the past.
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.
Lily is also a popular character to be paired with Snape in powerful Snape fanfiction. Given their history in the original story, fanfiction writers often explore what could have been if things had gone differently between them. It can be a very emotional and complex relationship in these fictional scenarios.
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.
One interesting plotline could be Snape going back in time and trying to prevent the death of Lily Potter. He might use his knowledge of the future to change certain events that led to her demise. Another could be him attempting to correct his own past mistakes, like his relationship with James Potter. Maybe he goes back and tries to befriend James earlier to avoid all the enmity that grew between them over the years.
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.
There could be other Death Eaters that Snape knew in his life. In the afterlife, they might be there to either confront him about his double - agent status or to seek redemption themselves. And sometimes, characters from Snape's childhood, like his parents or childhood friends, might appear to add more depth to his backstory and his experiences in the afterlife.
Hermione Granger is quite popular. Since she is intelligent and often stands up to authority, her interactions with Snape can be really engaging in fanfiction. She might challenge Snape on his teaching methods or they could collaborate on some complex magical research.
Obviously, Severus Snape is the central character. He is the one who travels back in time, so all the actions and changes are centered around him. But other important characters often include Lily Evans. Since Snape had a deep connection with her, he might try to interact with her in different ways to change the past.
Another character might be Draco Malfoy. There could be a story where Snape's daughter and Draco have a complicated relationship. Maybe they start off as rivals, given their different family backgrounds, but as they grow, they come to understand each other better and form an unexpected alliance.
Ron is also a common character. He could provide the comic relief as well as be part of the adventure with Harry. Dumbledore might also show up as he is the wise mentor figure. Harry might seek his advice on how to handle the changes he wants to make in the past without disrupting the future too much.