One aspect that could be delved into is their different leadership styles. Hiruzen was more of a traditional leader, while Tsunade brought a new perspective. Fanfiction might show how they interacted regarding village policies and decision - making. For example, they could have had debates on how to handle the ninja academy or allocate resources.
These interactions might also be important in terms of character development. For Tsunade, her relationship with Hiruzen could help her overcome her past traumas and hesitations about taking on the role of Hokage. And for Hiruzen, it could be a way to leave a lasting impact on the village through Tsunade.
Naruto would be deeply hurt. He has grown up with so little love and acceptance in the village, and Hiruzen was one of the few people he thought cared for him. His reaction could involve a lot of self - reflection. He might question his own worth and what he has done wrong. But ultimately, his positive nature would take over. He would try to understand Hiruzen's reasons, even if he didn't agree with them. And he would strive to find a way to reconcile and make Hiruzen see that he is not a threat.
Naruto might be initially confused. He trusts Tsunade, so being kidnapped by her would be completely unexpected. He would probably start by asking her why she's doing this.
Tsunade would probably be very suspicious at first. Naruto suddenly appearing from the future? It's not something that happens every day. She might think it's some kind of enemy's trick or a genjutsu.
Sakura would be heartbroken. She'd likely spend hours upon hours by Naruto's side, trying to jog his memory with stories of their adventures together. She might even get a bit overbearing in her attempts. Sasuke, who has his own complex relationship with Naruto, would be conflicted. He'd see Naruto's forgetfulness as a sign of weakness at first but then realize the importance of their bond. Kakashi, being the experienced leader, would start by observing Naruto carefully to see exactly how much he has forgotten and then start a systematic process of helping him remember.
One possibility could be Sakura. Since Sakura is also a student of Tsunade in the original series, she would fit well in the team. Her medical skills and combat abilities would complement Shizune's. Another member could be Ino. Ino has her own unique skills in mind - transfer jutsu which could be useful in different situations during their missions.
She might be initially shocked. Given her own past traumas and her relationship with Naruto, she could be hesitant at first. But then, considering Naruto's lonely situation, she might warm up to the idea and show a more maternal side towards him.
Tsunade could be a bit flustered at first. After all, she is a tough - as - nails leader, and a hug from Naruto, who she has watched grow up, might make her feel a bit vulnerable in a good way. She might then relax and even give Naruto a pat on the back in return, showing her appreciation for the gesture.