Another plot could be about their wedding day. How Raphtalia prepares for it, and the cultural elements involved in their wedding. Maybe there are unique traditions in the world of the fanfiction that they have to follow. And Naofumi's nervousness and excitement as the groom would also be an interesting part to explore.
One main supporting character could be Filo. She has been with Naofumi from the start and her relationship with both Raphtalia and Naofumi could add a lot to the story. She might be like a sister - like figure to them, always there to support them and add some comical moments to their married life.
Redemption can be a theme too. Naofumi has been through a lot of hardships and is often seen as an outcast in the original story. In fanfiction, his relationship with Raphtalia can be part of his journey towards redemption, with Raphtalia being a source of support. Also, there are fanfictions that focus on the power - up of both characters. As they face challenges, they gain new abilities and skills, and their relationship is strengthened through these experiences.
No, it is not appropriate. 'Naofumi and Raphtalia' are characters from a story, and creating sexual fanfiction about them goes against ethical and moral standards. It can also be disrespectful to the original work and its fans who may not want to see the characters in such inappropriate scenarios.
Yes. Their kiss is a big deal in the light novel. It shows how far their relationship has come from when they first met. It's not just a random act but a culmination of all the adventures they've had together, the trust they've built, and the feelings that have developed between them over time.
The plot generally revolves around Naofumi, who is summoned to a parallel world as one of the Four Cardinal Heroes. Raphtalia becomes his important companion. They face various challenges together, such as battles against powerful monsters and dealing with political intrigue in the new world.
You can focus on their friendship and how they support each other through difficult times. For example, write about their adventures and how they grow together as a team.
One good Raphtalia x Naofumi fanfiction is 'A New Beginning'. It shows their relationship growing in a unique way, with Raphtalia learning more about Naofumi's past and them facing new challenges together. Another one could be 'The Unbreakable Bond' which focuses on how they support each other through tough times in the story world.