If Sakura and Pein were siblings, it could potentially change the power dynamics in the Naruto universe. For example, Sakura might be able to influence Pein's actions to some extent. She could try to persuade him to avoid attacking Konoha or at least reduce the destruction. This could also change the way the other characters in Konoha view her, as she would be related to one of their most dangerous enemies.
Sakura's relationship with her friends could change quite a bit. Her female friends might be curious about what it's like to suddenly have Gaara as a brother. They could also be a bit jealous of the new connection she has. As for Gaara, his relationship with his Sand ninja friends could be affected as they might see Sakura as an outsider at first. But as time goes on, they could all learn to accept the new family situation and it could even lead to some joint training sessions and better cooperation between Konoha and Suna.
At first, it might be a relationship of mistrust. Pein may think Sakura is just a typical Konoha ninja who doesn't understand his grand plans. However, if Sakura were to show empathy towards the Akatsuki's cause (not necessarily agreeing with it, but understanding it), it could pique Pein's interest. He might start to open up to her a bit. As for Sakura, she could be initially repulsed by Pein's actions but as she gets to know him better, she realizes he's more than just a villain. This could lead to a complex relationship where they both influence each other's worldviews.
It would definitely shock their friends. Naruto, for instance, would be caught in a difficult position as he is a close friend to both. He would probably try to mediate but might not be successful.
At first, their relationship might be rocky. Pein could be cold and distant, but Sakura's warm personality would gradually break down his barriers. They might start as study partners, helping each other with schoolwork, which would lead to them sharing more personal thoughts and feelings.
Their relationship as siblings would mean Naruto might not be so obsessed with winning Sakura's love. This could change his focus and make him more dedicated to protecting their family. Sakura, on the other hand, would be more protective of Naruto from the start. It could also lead to different team dynamics in their ninja teams.
The relationship could also have an impact on the political situation in Konoha. If Naruto and Tenten are siblings, it could change the balance of power among the ninja clans. Their combined influence could be used to bring about new policies or changes in the village. For example, they might advocate for more training opportunities for orphaned ninja, given Naruto's own experience as an orphan.
Well, their relationship could bring a new dynamic to the village. People in Konoha would see their relationship as a sign of change. It might inspire more female ninjas to be more open about their relationships and not be held back by traditional ninja values.
On the other hand, this could also be a chance for Naruto and Kakashi to have a more open conversation. Naruto could share his thoughts on how the fanfiction is misinterpreting Kakashi, and Kakashi could use this as an opportunity to understand Naruto's perspective better. This could potentially strengthen their relationship as they gain a deeper understanding of each other's views on how Kakashi is perceived in different fictional scenarios.
If Naruto and Kurumu are siblings, it could have a big impact on Naruto's character development. He might become more protective of Kurumu, which could lead to him making different decisions in battles or in his interactions with other characters. Also, Kurumu could introduce new ideas and ways of thinking to Naruto that are different from what he learned in the ninja academy. This could change how he approaches problems and how he views the world around him. For instance, if Kurumu has a more diplomatic way of handling things, Naruto might start to use more negotiation rather than just brute force in some situations.
It could change the dynamics between the characters. For example, if Naruto's secret boyfriend was Sasuke, it would add a whole new layer to their already complex relationship. The reactions of other characters like Sakura would be very different. She might feel betrayed or confused.