For Minato, he could gain a new respect for Itachi's skills and the difficult situation he is in. He might see Itachi not just as an enemy from the Akatsuki, but as a complex individual. This could lead to Minato trying to find a way to redeem Itachi in the fanfiction. Itachi, on the other hand, could be inspired by Minato's leadership and selflessness, and perhaps try to find a way to protect his own village in a different way than he has been doing with the Akatsuki.
Itachi might start to question his loyalty to the Akatsuki after meeting Minato. Minato's strong sense of justice and love for his village could make Itachi re - evaluate his own actions.
Well, it could be that they meet by chance in a hidden forest. Minato might initially be cautious as he's aware of Itachi's reputation in the Akatsuki. But then they could start sharing their stories, like Itachi talking about his family's situation in Konoha and Minato sharing his experiences of protecting the village. They might even find some common ground in their love for their respective villages.
Kakashi could become more distrustful after meeting Tobi. Since Tobi is such a mysterious figure, Kakashi might start to suspect everyone around him more.
Keith could develop a stronger sense of self - confidence. Comparing himself to Sasuke, who is a highly skilled ninja, Keith may strive to improve himself even more. Sasuke could develop a sense of camaraderie that he has long lost. With Keith by his side, he might start to trust others again. In addition, they could both develop a more global perspective, understanding different worlds and ways of life through their interactions.
For Goku, he could gain a deeper understanding of his heritage. Meeting Bardock would make him more aware of his Saiyan side. He might become more confident in his Saiyan abilities. For Bardock, seeing Goku all grown up and powerful could give him a sense of peace. He could realize that his sacrifice was worth it and be proud of the man his son has become.
One possible development is that Naruto becomes more composed. Minato was calm under pressure, and Naruto could inherit this trait. He might also become more of a loner at first as Minato was often on solo missions. But as he grows, he would learn to balance this solitude with his need for friends. His leadership skills would improve too, as Minato was a great leader.
A female Itachi could have a more empathetic character development. Since in many interpretations, females are often seen as more in touch with their emotions. She might struggle more openly with the decision to sacrifice her family for the greater good. For example, she could have more internal conflict shown through her relationships with Sasuke and other Uchiha members. This would make her character more complex and relatable.
In this type of fanfiction, Harry could develop a new sense of respect for his enemies. Meeting Lucius face - to - face might make him realize that even the most despicable characters have their own motives and insecurities. As for Lucius, he might be forced to re - evaluate his view of Harry. He may start to see Harry not just as a troublemaker, but as a real threat to his way of life. This could lead to him taking more extreme measures against Harry or, in a different turn, trying to co - opt Harry into his schemes.
Both characters could develop a mutual respect for each other. Steven would respect Blue Diamond's long history and power, while Blue Diamond would come to respect Steven's unique position as a bridge between two worlds. This newfound respect could change how they interact with their respective groups as well.
Vegeta could become more empathetic. Meeting Future Bulma might expose him to different perspectives and make him understand the consequences of his actions better.
Goku could develop a deeper sense of his Saiyan identity. Knowing his father, he might start to embrace more of the Saiyan warrior spirit. Bardock might change too, seeing the good in the universe through Goku's eyes.