The reactions of the characters can be quite diverse. For the female characters who are in love with Naruto, like Ino, she could be very competitive. She might try to find a way to insert herself into the situation or at least make sure her feelings are known. The older generation, such as the village elders, would likely be more focused on the political and strategic benefits of the marriage contracts. They would expect Naruto to fulfill his duties as a husband in each contract for the good of the village. However, Naruto's younger friends, like Choji and Kiba, might be more excited about the idea. They could see it as a new and interesting adventure for Naruto, not fully understanding the complexity of the relationships involved.
Sakura might be initially shocked and a bit jealous. She has always had a special relationship with Naruto, and seeing him enter into multiple marriage contracts could make her feel left out or betrayed. Sasuke, on the other hand, might be more indifferent on the surface but secretly concerned. He may worry about how these contracts will affect Naruto's focus on their shared goals. Hinata would probably be heartbroken if she wasn't one of the brides. If she is, she'd be both extremely happy but also nervous about sharing Naruto with others. His other friends like Shikamaru might be skeptical, thinking it's a bad idea and will lead to chaos in Naruto's life.
One common plotline is the political aspect. In the Naruto universe, marriages can be used to form alliances between different clans or villages. So, in fanfiction with multiple marriage contracts, there might be a situation where Naruto is forced into these contracts to bring peace. For example, he could be married to a representative from a powerful clan in Konoha and also to someone from a rival village to end long - standing feuds. Another plotline could be centered around love triangles or more complex relationship dynamics. Maybe Naruto has feelings for one person but is contractually bound to others, leading to a lot of emotional turmoil and drama. Also, some fanfictions might explore how Naruto's multiple marriages affect his ninja duties and his relationships with his friends like Sasuke and Sakura.
Iruka sensei would be very proud of Naruto. He has been like a father figure to Naruto, and seeing him get married to Sakura would make him feel like Naruto has truly grown up. As for the other villagers, most of them would be happy as Naruto is a hero. They would see Sakura as a great match for him, someone who can support him and also contribute to the village with her skills.
The village elders in the fanfiction might see it as a threat and immediately start planning to stop Dark Naruto. They would view his betrayal as a sign of instability and danger to the village's safety. This could lead to a divide in the village, with some believing Naruto can be redeemed and others thinking he should be eliminated.
Some characters rebel. For example, Hermione might use her intelligence and knowledge of magic to find loopholes in the contract. She could be very vocal about her opposition to the archaic practice. Others, like Harry, might initially feel pressured but then try to communicate with the other party involved. They might try to come to an understanding and find a way to make the situation more bearable.
Sakura, being a medical ninja, would immediately start examining Naruto. She'd be very worried and use all her skills to try and diagnose the illness. Sasuke, on the other hand, might not show his concern openly but would be constantly on edge. He might secretly look for ways to help Naruto get better. Shikamaru would probably start thinking of strategies to keep the village safe while Naruto is sick.
Some characters might be immediately drawn to the devil game out of curiosity and a thirst for power. For instance, Naruto might see it as a new challenge to overcome and prove himself. Others, like Sasuke, could be more cautious and suspect it's a trap from the start.
In many fanfictions, Naruto starts to see Hinata not just as a friend but as a life partner. He begins to understand the depth of her love for him that was always there. This makes him more protective of her. Hinata, on the other hand, starts to come out of her shell. She becomes more involved in Naruto's world, perhaps even helping him with his ninja duties in some cases. Their relationship becomes a catalyst for their individual growth.
Through training. Just like in the original Naruto series, characters with multiple bloodlines would need to train hard to master their abilities. They might start with basic techniques related to each bloodline and gradually build up to more complex ones.
Sasuke would be deeply affected. He and Naruto had a complex relationship. He might feel a sense of regret for all the times he had pushed Naruto away. His reaction could range from anger at the situation to a new - found respect for Naruto's sacrifice.
Sakura would be completely devastated. She's been in love with Sasuke for so long and has a deep bond with Naruto too. She might go into a deep depression and lose her will to be a ninja for a while.