For Tsunade, her development could involve her learning to trust in the future again through the hope of the new life. She might let go of some of her past regrets. Dan could develop his leadership skills as he prepares to be a father. He could start to take on more of a mentoring role within the village, inspired by the thought of guiding his own child one day.
Tsunade's character might experience a softening as she anticipates motherhood. She could become more in tune with her emotions and less guarded. Dan, in this process, could develop into a more patient man, especially when dealing with Tsunade's mood swings during pregnancy. He would also likely become more of a home - body, focusing on building a stable family environment.
For Sakura, it could be a sign of her growing confidence and equality with Tsunade. If she initiates the kiss, it shows that she has come a long way from being a shy apprentice. She is now bold enough to express her feelings, whether it's a platonic deep love or something more complex. For Tsunade, it might make her more vulnerable. She has always been seen as a tough leader, but this moment could show that she has a soft side that she only shows to a select few, like Sakura.
Naruto could develop more maturity under Tsunade's influence. Tsunade, being an experienced and strong - willed character, can teach Naruto how to better control his emotions in difficult situations.
Well, Naruto might grow in his ability to handle complex situations. Hypnotizing Tsunade is no small matter. He has to deal with the consequences, and this could make him a more mature ninja. As for Tsunade, she could have a new perspective on Naruto. Before, she may have seen him as just a young, rambunctious ninja. But after this incident, she realizes his power and potential, and their relationship could evolve into more of a mentor - mentee relationship where she actively guides him in his ninja journey.
One possible plot development is that Tsunade could step up her efforts in uniting the other villages. Since Naruto was a symbol of hope and unity, his death might prompt Tsunade to work even harder to prevent further chaos among the ninja villages. She could initiate more diplomatic meetings and treaties to ensure peace in Naruto's memory.
A plot could develop where Naruto and Tsunade try to keep the pregnancy a secret at first. As the pregnancy progresses, it becomes harder to hide. Naruto may start to train even harder to prove himself worthy of being a father and to protect his unborn child. Tsunade, on the other hand, might face challenges from the medical community as her pregnancy at her age could be considered high - risk. And there could be a rift in their relationship as they deal with the stress and the different ways they approach the situation.
One possible plot development could be that Tsunade trains Naruto more intensively in medical ninjutsu. Since she's his grandmother, she might feel a stronger obligation to pass on her skills.
Percy could become more in touch with his emotional side through Piper's influence. Piper, on the other hand, might gain more confidence in her combat abilities with Percy's training. For example, Percy could teach Piper some water - based combat techniques, and Piper could show Percy how to better understand and manipulate emotions in battle.
For Naruto, he could develop more understanding of the darker side of the ninja world through his interactions with Tayuya. Tayuya, on the other hand, might start to see the value of friendship and loyalty like Naruto has. For example, Naruto's unwavering belief in his friends could rub off on Tayuya, making her question her previous solitary and somewhat ruthless ways.
In the fanfiction, Ichigo could develop a new level of confidence in his abilities. Kukaku's unwavering belief in his potential could inspire him. Kukaku could experience a change in her own goals. Maybe after seeing Ichigo's selfless acts, she decides to focus more on helping others rather than just her own family's affairs. Their relationship could also lead to a mutual growth in their spiritual powers as they support and learn from each other.
In a fanfiction, Sakura could develop her leadership skills. If she and Kushina are in a situation where they need to lead a group, Sakura could learn from Kushina's natural charisma. Kushina could also develop her relationships with the new generation. She could start to see the potential in Sakura and other young ninjas and become a mentor figure, which would be a new role for her compared to her previous life.