One possible plot could be that Naruto and Serafall meet through some sort of interdimensional event. They initially have misunderstandings due to their different worlds and cultures. But as they get to know each other, they find common ground in their strong wills and desires to protect. Eventually, they fall in love and decide to get married, facing opposition from some who don't believe in cross - dimensional relationships.
One possible plot could be that Naruto, in his devil form, meets Serafall in the underworld. They start off as rivals, constantly competing in various devilish tasks or battles. But as time goes on, they begin to see the good in each other. Naruto's strong sense of justice and loyalty, which he carried from his shinobi days, intrigues Serafall. And Serafall's charm and power attract Naruto. Eventually, they fall in love and get married, uniting the power of the shinobi world and the devil world in a unique way.
The plot could start with Serafall being intrigued by Naruto's chakra. She visits the Naruto world out of curiosity. Naruto, always friendly to strangers, shows her around. They quickly become friends and find that they have a lot in common in terms of their goals - both want to protect their respective worlds. As their friendship blossoms into love, they plan their wedding. However, there are villains who don't want this union to happen. These villains try to create misunderstandings between them and also threaten the safety of both worlds. But Naruto and Serafall, with the help of their friends, overcome all these obstacles and finally get married, with a grand ceremony attended by both humans and beings from Serafall's world.
The plot could start with Serafall being intrigued by the tales of Harry Potter that reach her realm. She decides to seek him out using her powerful magic. When they meet, Harry is initially cautious but soon realizes that Serafall has a good heart. Their relationship develops slowly as they learn about each other's cultures. For the marriage to happen, they have to combine the traditions of the wizarding world and Serafall's world. This could include a magical ceremony where they exchange unique magical artifacts as a symbol of their union.
Sasuke would be a great side character. He could be skeptical of Serafall at first, thinking she might be a threat to Naruto or the ninja world. But as he sees how much Naruto loves her, he slowly accepts it. Grayfia from Serafall's world could be another side character. She might be tasked with helping Serafall adjust to her new married life in Naruto's world, and her strict and efficient nature could lead to some comical situations.
There could also be a group of dark mages who want to use the chaos of this inter - dimensional relationship for their own gain. They might try to manipulate Harry and Serafall's families and friends against the marriage, and then when things are at their worst, try to steal their combined magical power which they believe will be extremely potent when Harry and Serafall are united through marriage.
One common theme is the clash of different personalities. Naruto has his own set of values and beliefs, and Serafall has hers. When combined in a harem setting, there are often clashes and reconciliations. Another theme is the development of relationships, not just romantic ones but also friendships within the harem.
Well, if Naruto and Serafall were to date in a fanfic, it would be an interesting mix. Naruto's energetic and determined nature could complement Serafall's more flamboyant and powerful self. They might go on adventures together, with Naruto showing Serafall the world of ninja, and Serafall introducing Naruto to the magic realm she comes from. Their relationship could be filled with mutual respect as they learn from each other's strengths.
One possible plot could be that they get married to strengthen the alliance between Konoha and Shion's village. Then they have to deal with political intrigues from other villages who don't want to see this alliance grow strong.
One possible plot point could be the initial meeting. Maybe Harry, in his 'godlike' state, stumbles upon Serafall's realm and they are instantly intrigued by each other. Another could be the challenges they face due to coming from different worlds, like cultural differences in their magical practices.
In a 'Naruto x Shion married' fanfiction, the story could start with their wedding ceremony. It would be a grand event with shinobi from different villages attending. After marriage, Naruto discovers new aspects of Shion's personality. She might be shy in private but strong - willed in public. They could also travel together to explore the secrets of Shion's home village, uncovering ancient shinobi techniques that could benefit the entire ninja world. And of course, there would be many cute and romantic moments between them as they build their life together.