Perhaps a healer who has treated Snape in the past. She would have seen his vulnerable side during his times of injury or illness. Her caring nature could draw Snape to her, and over time, they could develop a deep emotional connection that turns into love.
A possible character could be a fellow Hogwarts teacher. Maybe a new potions teacher who shares Snape's passion for the subject. They could start off as rivals in the classroom but gradually fall in love as they discover their shared interests and values.
Another option could be a witch from a small, secretive magical community. She might come to Hogwarts on some magical business and cross paths with Snape. Her different way of life and magic could intrigue Snape, and they could develop a relationship based on mutual curiosity and attraction.
Hinata could be a likely candidate in such a fanfiction. Since she is Naruto's real - life wife in the original series. Writers might twist their relationship in fanfiction and create a scenario where she betrays him. Maybe due to some family pressure or a misunderstanding that gets out of hand.
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.
She might be an original character created specifically for the fanfiction. This character could be a witch from a far - off land with unique magical powers. She comes to Hogwarts on some sort of exchange program and meets Snape. Their relationship starts off as a friendship that gradually blossoms into love.
Harry Potter is a very likely character. Given his often - tense relationship with Snape, detention with Snape could be a great opportunity to explore their dynamic further. Harry might learn more about Snape's motives during these detentions, or they could have some unexpected conversations that change Harry's perception of Snape.
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.
One possible plot could be that they are in a forced marriage. Maybe as part of some dark deal between Voldemort and Dumbledore's side. And they have to learn to live with each other, gradually finding unexpected common ground.
Maybe an orphaned wizard who has a connection to Snape's past. Snape feels a sense of obligation to protect him. This wizard could be the son of an old acquaintance of Snape's, and his presence in Hogwarts stirs up old memories and emotions for Snape. The fanfiction could revolve around how Snape deals with these emotions while protecting the young wizard.
Obviously, Harry Potter and Snape are the main characters. Harry, with his courage and leadership, and Snape, with his complex past and skills. But other characters like Hermione and Ron could also play important roles. They might be the ones who first notice the change in Snape's behavior towards Harry and help Harry deal with this new situation.
The Death Eaters who have caused harm to Harry's family and friends are also probable targets. Snape, having been a double - agent among the Death Eaters, could help Harry take revenge on those who have killed his parents or endangered his loved ones. He could provide crucial information about their whereabouts or weaknesses.
Perhaps an old enemy from Snape's past, someone who has a long - standing grudge against him. This person could have tracked him down to the Shrieking Shack and finally got their revenge. It could be someone related to his days as a Death Eater or even from his school days when he might have made some enemies.