Well, a de-aged Sanji fanfic could have him struggling to adapt to a world he once knew as an adult. There could be adventures related to his re-growing and rediscovering his powers. Or, it might focus on how his relationships with other characters change due to his new age.
For Nami, her intelligence and cunning are key. She could use her smarts to get Sanji out of trouble in the fanfiction. Also, her love for money and treasure can add an interesting dynamic. For example, she might convince Sanji to go on a dangerous adventure in search of a valuable item, promising him new ingredients for his kitchen.
It can be developed through shared hobbies in the modern world. For instance, if they both like extreme sports, they could bond over skydiving or surfing. This would not only bring them closer but also show a different side of their characters.
Their relationship in the Zoro x Sanji Christmas fanfic could be presented through a series of challenges and reconciliations. For instance, when they are tasked with getting a Christmas tree for the ship. Zoro wants to just chop down the first tree he sees, but Sanji has very specific requirements. They argue, but then realize that by combining their ideas, they can get the perfect tree. This pattern of arguing and then coming together could be repeated throughout the Christmas celebration, showing the complexity and depth of their relationship.
I'm not really sure as I haven't specifically heard of this 'p se pyaar f se faraar real story'. It could be a very specific regional or personal story. Maybe it's about a relationship that started with 'p' (whatever that represents in this context) in terms of love and then had some kind of flight or escape represented by 'f'. But without more context, it's hard to say for sure.
Fanfics about Sanji can also be about his dreams and aspirations. In the original story, we know he has certain goals related to the All Blue. A fanfic could expand on this, perhaps he discovers a hidden route to the All Blue but has to overcome various obstacles, like dealing with a rival chef who also wants to claim the All Blue for himself, or facing a sea monster that guards the entrance to this mythical place.
Yes, there might be. In the world of fanfiction, all kinds of crossovers are possible. Some fans like to create scenarios where characters from different series interact. Naruto could potentially be a big fan of Sanji in a fan - made story. This could lead to interesting plotlines, like Naruto being inspired by Sanji's cooking skills or his chivalrous attitude.