A great fanfiction idea might be that John and Seraphina get transported to a different time period. They would have to adapt to the new era while also relying on each other, which would make for a really engaging story.
One interesting story could be about John and Seraphina going on an adventure in a magical realm. They might face challenges together and their relationship could grow stronger through it.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms have a vast collection of fanfictions for various fandoms, and there's a good chance you'll find John and Seraphina fanfictions there.
One popular theme is the development of their relationship. Writers often explore how they get closer, overcome obstacles in their relationship, and grow to understand each other better.
You can start by looking on popular fanfiction websites like Archive of Our Own. It has a large collection of different fanfictions, and you can search specifically for John and Seraphina ones.
I haven't actually read this particular fanfic in full. But generally, in fanfics about John and Seraphina from 'unordinary', the relationship between the two characters can be explored in many interesting ways. Maybe this fanfic focuses on their friendship or a potential romantic relationship in a unique setting within the 'unordinary' universe.
One common theme is friendship turned into something more. Their initial acquaintance might be as friends, but as the story progresses, romantic feelings start to develop.
One great 'Unordinary John x Seraphina' fanfic is 'A New Bond'. It explores their relationship in a post - school battle scenario where they have to team up against a new threat. The way the author develops their characters and the chemistry between them is really engaging.
Good fanfics in this pairing usually have a balance between action and emotion. Maybe they are fighting together against a common enemy, which shows their teamwork and physical connection. At the same time, there are emotional moments, like when they open up to each other about their fears or dreams. This combination makes the story more engaging. Moreover, the writing style should be smooth and easy to read so that readers can fully immerse themselves in the story of John and Seraphina.
One idea could be exploring Dark Seraphina's origin. Maybe she was once a normal angel but something tragic happened that turned her dark. Another could be a story where she teams up with an unlikely ally, like a human with special powers, to fight a common enemy. It could also be interesting to write about her trying to redeem herself.
One interesting character to pair with Dark Seraphina would be a fallen angel like herself but from a different origin. They could share their experiences of losing their grace and try to find a way back together. A powerful sorceress could also be a great match. The sorceress could offer her magical assistance in exchange for something Dark Seraphina has, like a piece of her dark power. And a mysterious knight with a dark past could be paired with her. Their dark pasts could bond them as they fight against a greater evil that threatens their world.
You can try searching on popular fanfic websites such as Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there's a good chance you'll find the 'unordinary john and seraphina lemon fanfic' there.