One common theme is identity. Simon becoming a vampire changes a lot for him, and many fanfictions explore how he comes to terms with this new identity. Another theme is love and relationships. His relationships with other characters, especially romantic ones, are often explored.
In some fanfics, Simon and Clary's love is a slow - burn type. They start as friends, but as they fight side by side against demons, they gradually realize their feelings are more than just friendship. For example, there could be a scene where Simon saves Clary from a particularly powerful demon, and in that moment of relief and gratitude, they share a kiss that changes everything between them.
One really good 'Shadowhunters vampire Simon fanfiction' that I've come across is one that delves deep into Simon's internal conflict. He's a vampire, but he still has his human side and the values he held as a human. This story shows how he tries to balance his new vampiric nature with his old self. It also has some great interactions with the other Shadowhunters characters, like Clary. The author does a wonderful job of portraying Simon's complex emotions and the challenges he faces in this new life.
Another scenario could be that Clary has to choose between her duties as a Shadowhunter and her love for Simon. She loves the Shadowhunter world and wants to protect it, but she also loves Simon deeply. In the fanfic, she might find a way to balance both, which is a great exploration of their love.
Another theme is his place in the vampire world. He has to figure out where he stands among other vampires, whether he'll follow the rules or rebel. Some fanfictions might focus on his interactions with more powerful vampires and how he tries to assert himself or find his own path within the vampire hierarchy.
Well, one possibility could be that Simon's amnesia leads to him forgetting his relationship with Rapheal. This might cause confusion and misunderstandings between them. Maybe he starts to see Rapheal as a stranger and Rapheal has to work hard to re - establish their connection.
A well - crafted plot that combines the two different universes is key. It could involve how their different supernatural worlds interact, like the vampires in 'Twilight' and the demons in 'Shadowhunters'. Maybe a situation where they have to use their unique abilities to solve a problem that spans both worlds.
He could become very protective of Simon. Since Simon has amnesia, Rapheal might feel responsible for his well - being. He would be on guard against any potential threats that could take advantage of Simon's vulnerable state. Also, Rapheal might be sad and frustrated because the Simon he knew is 'gone' for now.
One popular Bella Swan and Simon Lewis fanfiction is 'Unexpected Alliances'. It explores a unique scenario where Bella and Simon team up against a common supernatural threat in a world that combines elements from their respective fictional universes. It has great character development and an engaging plot.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). There are often many well - written Vampire Simon Lewis fanfictions there. Just use the search function and type in 'Vampire Simon Lewis' and you'll get a list of relevant stories.