In this fanfiction, there could be a plotline where Severus Snape has no connection to the Death Eaters at all. Instead, he is on a quest to find a way to end the war between the wizarding world and the Dark forces without being involved in the Death Eater ideology. He might be traveling to different magical places, learning ancient spells and secrets that can be used to bring peace. His character would be more of an independent agent for good, rather than being associated with the evil Death Eaters.
A possible plotline could be that Severus was framed as a Death Eater. He might be trying to clear his name throughout the fanfiction. Another idea is that he is part of a secret organization that is dedicated to taking down the Death Eaters from the inside, but they have to operate in secrecy so it appears he is one of them.
One way is by emphasizing his true loyalties all along. Maybe he was secretly working against the Death Eaters while pretending to be one. His love for Lily could be the driving force. He could be shown as using his position among the Death Eaters to gather intelligence for the Order of the Phoenix, constantly trying to undermine Voldemort's plans without the other Death Eaters suspecting.
There are several. Some focus on Snape's early days as a Death Eater. For example, in one fanfic, it details how he was recruited, his initial thoughts on Voldemort's ideology, and how he gradually started to question it. It also shows how his relationships with his fellow Death Eaters were formed and evolved over time.
One common theme is Snape's internal conflict. Since he was a double agent, fanfictions often explore the turmoil he felt between his loyalty to Voldemort as a Death Eater and his real allegiance to Dumbledore. Another theme is his relationships with other Death Eaters, like Bellatrix or Lucius.
There could be a plot where Snape's muteness is a secret that he tries to hide from everyone at Hogwarts. The story could be about how he manages to teach Potions and be a double agent for Dumbledore all while keeping this secret. Or perhaps a plot where his muteness is a magical experiment gone wrong, and the story is about his journey to reverse it. Along the way, he might discover new aspects of magic and his own identity that he never knew before.
First, think about the major change in the alternate universe. For example, if Snape is a pirate in this universe, consider how his skills and personality traits from the original story would translate. His potion - making could be used to create unique potions for his pirate crew, like ones that can make the ship invisible. Then, outline a basic plot, such as Snape's search for a magical treasure that was lost at sea.
One possible plotline could be that Severus Snape discovers he has royal blood. He then has to navigate the complex world of royalty while still dealing with his duties at Hogwarts. Maybe he uses his new - found status to gain more influence in the wizarding world, but also has to face those who are jealous or suspicious of his sudden rise.
Perhaps a plot where Severus discovers his demigod heritage and has to balance it with his life at Hogwarts. He could struggle with how to use his new - found powers without drawing too much attention, while also dealing with his complex relationships with other characters like Harry Potter.
One interesting plotline could be exploring Snape's early interactions with the Marauders. Maybe it shows how his enmity with them truly began. For example, it could focus on a particular incident in their school days that was a turning point.
One interesting plotline could be the protagonist using Snape's knowledge of potions to create new and revolutionary brews. For example, they might discover a potion that can heal previously incurable dark magic wounds. Another plotline could involve the character trying to change Snape's fate in the wizarding world. They could attempt to prevent Snape from getting involved in certain dangerous or tragic events, like his involvement with the Death Eaters in his youth. Also, there could be a plot where the reincarnated character uses Snape's occlumency skills to uncover hidden secrets in Hogwarts that were previously unknown.
Another plotline could involve the Mudblood initially being terrified of the Death Eater due to their reputation. But as the story progresses, she might see the good in him and start to fall in love too. Their relationship could then be a story of overcoming differences and prejudices. For instance, they might have to face opposition from both the wizarding world that hates Death Eaters and the Muggle - born community that is suspicious of the Death Eater's motives.