One important element is his family background in the Vinsmoke family. They were a family focused on power and had no place for Sanji's kindness. His passion for cooking was also crucial. It was what made him different from his family. And finally, his escape and the journey he had to endure to become a part of the Straw Hat pirates are significant elements. He had to face many challenges and learn a lot on his own, which shaped his personality.
The key elements in Sanji's back story are his family, the Vinsmokes. His different nature compared to his siblings is also important. And of course, his love for cooking.
I think it might have been a character introduced to add depth to Sanji's backstory and motivations. But without more context, it's hard to say for sure.
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.
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.
Well, without more context, it's difficult to say precisely. It could be that Sanji is a victim in this ghost story, constantly haunted by a malevolent spirit. Maybe the story is set in a small, isolated town where Sanji discovers some dark secrets related to the ghosts that are terrorizing the place.
Another characteristic is the exploration of new relationships. Since Sanji is a popular character, in female - centered fanfiction, new relationships with female characters can be created. These relationships can range from romantic to platonic, and they add new dimensions to Sanji's character. For instance, he might form a strong friendship with a female swordsman in a fanfic.
Well, without more context about Sanji's story, it's difficult to determine exactly who the little girl is. It could be a childhood acquaintance of Sanji, or perhaps a character he meets during his adventures. Maybe she is someone related to a quest or a mystery in the story.
Sanji was born into the Vinsmoke family. His family was cruel and saw him as a disappointment. They treated him poorly because he showed kindness and emotions which they considered weak. Sanji ran away and ended up on a ship where he learned to cook and started his journey towards becoming a great chef and a Straw Hat pirate.