I think Kakashi's interaction with Minato would be very interesting. Kakashi was Minato's student. Meeting his sensei again, especially with Team 7 in tow, would bring back a lot of memories. Kakashi could show Minato how he has grown and passed on Minato's teachings. And Minato could give Kakashi some new insights based on his own experiences.
Sasuke and Minato could also have a fascinating interaction. Sasuke, with his thirst for power and his Uchiha heritage, could be intrigued by Minato's power. Minato, on the other hand, might see the potential in Sasuke and try to guide him away from the path of vengeance. This would be a clash of two strong - willed characters with different outlooks on life and power.
I think Kakashi's interactions with his younger self would be really cool. He could see how much he has changed over the years and maybe give some advice to his younger self. Also, the interaction between Sakura and Rin. Rin could be like an older sister figure to Sakura, teaching her more about being a kunoichi and sharing her experiences in love and friendship, especially considering Rin's complex relationship with Kakashi and Obito.
Probably Naruto. Since Minato is his father, he has always longed to know more about him. Meeting Minato and his team would be a dream come true for Naruto. He would be eager to hear stories from his father's past, about his training, and how he became such a great ninja. Naruto might also want to show off his own skills to his father and the rest of Team Minato.
Supergirl would be really interesting. Her alien origin and her super strength, along with her ability to fly, would make her stand out. She could bring a new dynamic to Team Flash with her different set of powers and her more idealistic view of heroism, which might contrast with some of the more street - level concerns of Team Flash.
One possible plot could be a training session. Team 7, consisting of Naruto, Sasuke, Sakura and Kakashi, might meet Team Minato, which includes Minato, Obito, Rin and Kakashi in his younger days. They could engage in friendly sparring matches. Naruto would be excited to meet his father Minato and learn some new jutsu from him. The two teams could also exchange stories about their adventures, like Team 7 talking about their battles against the Akatsuki, and Team Minato sharing their experiences during the Third Great Ninja War.
In this fanfiction, there could be an epic battle of skills. Team Minato, with their unique abilities from their time, could test the mettle of Team 7. Maybe Minato's lightning - fast speed would be pitted against Naruto's new - found powers. It would be a clash of different generations of shinobi.
It could be Kakashi. Since he has such a complex backstory and is a very popular character. The story could revolve around how he interacts with Team Minato and how his presence affects their dynamic.
Well, if Team Minato meets Team Kakashi in a fanfiction, it could lead to some epic battles or friendly competitions. Maybe they would have a sparring match to see which team is stronger. Team Minato with their speed and unique jutsus, and Team Kakashi with their diverse skills. Or they could collaborate on a mission, with Minato's leadership guiding both teams. It would be exciting to see how the different personalities interact, like Obito from Team Minato and Kakashi from Team Kakashi. They have a complex history that could be explored further in such a meeting.
Another interesting interaction would be between Master Chief and Emile. Emile is very much a front - line fighter with his own unique combat style. Master Chief, being a super - soldier, would have his own way of fighting. Emile might be a bit in awe of Master Chief's abilities at first, but then they could have some intense sparring sessions where they learn from each other's combat techniques and develop a mutual respect.
In a fanfiction where Team Minato meets Hokage Naruto, it could be an emotional encounter. Minato might be extremely proud of what Naruto has become. Naruto would likely be in awe of seeing his father and his old - time teammates. They could exchange stories about their experiences, and Naruto could show Minato how far the village has come since his time.
Emotionally, it would be a powerful encounter. They might share their feelings about the losses they've all faced, like the death of Minato. This could strengthen their relationships and also give Kakashi new insights as Hokage on how to protect the village better.