Fanfiction about Snape fighting Voldemort: What are some interesting plot ideas?

Another interesting plot could be a backstory about how Snape first got involved with Voldemort. Maybe it was out of a thirst for power initially, but then his views changed over time. This could be delved into in great detail, showing his transformation from a potential dark wizard follower to a hero in the fight against Voldemort.

Perhaps a plot where Voldemort discovers that Lucius has been having doubts about his leadership. He then tasks Snape with spying on Lucius. Meanwhile, Harry, through some magical accident, gets involved in this web of intrigue. The story could be about how Harry uses this situation to his advantage to try and bring down Voldemort's regime from within.

Perhaps Voldemort's son is raised in secret by a group of witches and wizards who want to give him a chance at a normal life. But as he grows older, he starts to show signs of his father's power. This could lead to a conflict within him as he decides whether to embrace or reject his dark powers. He could also go on a journey to learn about his father's past, only to be horrified by what he discovers and then vow to be different.

One plot idea could be that Snape kidnaps a student he suspects of being involved in a dark magic plot against Hogwarts. He wants to question the student privately to get to the bottom of it. Another could be that he kidnaps someone he believes has information about Voldemort's next move, thinking he can protect that person and extract the information at the same time. Or perhaps he kidnaps a character in a fit of jealousy or to protect them from a greater danger he foresees.

A great plot twist might be that the fight is a test set up by Dumbledore's spirit. He wants to see if Harry can overcome his prejudice towards Snape. So, it's not a real fight to the death, but rather a test of character. Harry realizes this mid - fight and has to make a choice about how to proceed. This would add a whole new layer to their relationship.

There might be a fanfiction where Voldemort discovers Snape's true loyalty is not fully with him. This could lead to a really tense showdown between them. Snape would have to use all his skills in magic and deception to survive. Maybe he has to convince Voldemort that he was only pretending to be against him to gain more information for the Dark Lord.

A plot could involve Ginny being the key to defeating Voldemort once and for all in a way that no one expected. Since she has a strong connection to Harry, and Harry was once a Horcrux of Voldemort, perhaps her magic has a unique ability to target and destroy the remaining essence of Voldemort. This could lead to a thrilling adventure where Harry and Ginny have to work together in a very different way than before to finally rid the wizarding world of Voldemort's threat.

One plot idea could be that Harry gives himself to Voldemort in an attempt to understand the Dark Lord's mind and find a weakness from within. Another could be that he sacrifices himself this way to protect his friends and Hogwarts, believing that there's a way to turn Voldemort's victory into a defeat from the inside. Or perhaps Harry has a vision that shows this as the only way to truly end the war and he decides to take the risk.

One plot idea could be that they discover they are mates due to a powerful magical bond. They then have to hide this fact from the wizarding world which is in the midst of a war. Harry might try to convince Voldemort to abandon his dark ways, using their newfound connection as a way to appeal to his better nature.

One plot idea could be that the female Voldemort has a change of heart. Maybe she starts to see the error of Voldemort's ways after interacting with Harry Potter. She could start to secretly help Harry and his friends against the Death Eaters, which would create a lot of internal conflict within the Dark side.