Well, one way is through character backstories. The female vampire could have a tragic past that Naruto helps her overcome. For example, she was turned into a vampire against her will and Naruto, with his positive attitude, shows her a new way of living. This would build an emotional connection between them.
For Naruto, he could be developed by showing how his interaction with Fem Jiraiya changes his view on female ninjas. He might become more respectful towards them and learn different fighting styles from her. As for Fem Jiraiya, her character could be developed by exploring her past. Maybe she had a difficult upbringing in a male - dominated ninja world and this has shaped her into a strong and independent ninja. This backstory can be revealed gradually as she trains Naruto.
The development should also include how she interacts with other characters. Her yandere behavior might not be obvious to everyone at first. She could be sweet and friendly on the surface, but there are little signs that something is off, like the way she clenches her fists when Naruto talks to another girl or how she subtly tries to isolate Naruto from his friends over time.
Their relationship can be developed through shared experiences. For example, when they face a powerful enemy together, Fem Naruto relying on Fem Kyubi's power and Fem Kyubi trusting Fem Naruto's skills. This mutual trust can deepen their bond.
Their relationship can be developed through shared experiences. For example, going on dangerous missions together. Each time they face a new threat, they learn more about each other's abilities and personalities. Naruto's positive attitude can slowly break down Fem Sasuke's more reserved nature.
To develop the relationship between Naruto and Fem Kobaoto in the fanfiction, it can begin with a chance encounter. For instance, Fem Kobaoto is in trouble and Naruto comes to her rescue. This initial act of heroism can make Fem Kobaoto see Naruto in a positive light. From there, they could be involved in a series of events that force them to spend more time together. They might attend a ninja festival together where they share some fun moments. As they interact more, they discover shared interests such as a love for a particular type of ramen. This discovery of commonalities can be the foundation for a deeper relationship. Also, as they face challenges together, like dealing with a powerful rogue ninja threatening the village, they rely on each other's strengths and their relationship evolves.
The concept can be developed by exploring Naruto's reasons for turning evil. It could be due to a past trauma that was never resolved, like the death of someone close being blamed on the village. Hinata then becomes a symbol of hope for him to return to the light.
Fem Naruto could be developed as a more empathetic and romantic character. She might use the yellow rose as a way to show her softer side to Gaara. Gaara, on the other hand, could become more open and less reserved. The yellow rose could act as a catalyst for his emotional growth.
Naruto could be very protective. He might start learning more about taking care of a pregnant woman, like cooking healthy meals for the fem oc. He would also constantly be by her side during her doctor visits, showing his support and love.
Their relationship could start with mutual respect for each other's abilities. Shikamaru admires fem Naruto's determination, and Naruto respects Shikamaru's intelligence. This could gradually turn into a deep friendship as they go on more missions together.
Tsunade can be developed in terms of her vulnerability. As the Hokage, she is often in a position of power and authority. But in this fanfic concept, being ticklish reveals a more human and approachable side of her. She may become more open to Naruto's antics and show a softer side that she usually keeps hidden. This can also lead to her trusting Naruto more and sharing more of her thoughts and feelings with him.