Naruto would probably be shocked at first. He might not have expected Hinata to leave him for Kiba. He could be angry at himself for not noticing Hinata's unhappiness sooner.
Naruto would be deeply hurt. He may initially react with anger, thinking that Hinata is making a big mistake. But as he calms down, he would realize that he may have taken Hinata for granted. He would remember all the times Hinata was there for him, and now that she's leaving for Kiba, he would feel a void in his heart. He might even try to win her back at first, but if Hinata is firm in her decision, Naruto would have to come to terms with it, and it could be a turning point for his character growth, making him more aware of the importance of relationships.
In such a fanfiction, the plot could involve Hinata feeling unappreciated by Naruto. Maybe Naruto is too focused on his ninja dreams and ignores Hinata's feelings. Kiba, on the other hand, might have been there for Hinata during her low moments, showing her kindness and understanding that Naruto didn't. So, Hinata decides to leave Naruto for Kiba.
Naruto would be extremely hurt. He loves Hinata deeply and to find out she cheated with Kiba would be a huge blow to him. He might go into a state of shock and disbelief at first.
One possible fanfiction could be about a mission where Naruto, Hinata, and Kiba have to work together. Maybe they are sent to a far - off land to retrieve a rare herb. Naruto's enthusiasm, Hinata's gentle strength, and Kiba's tenacity could all play important roles in this adventure. Along the way, they face various challenges like difficult terrain and enemy ninjas. Naruto might be the first to charge into battle, Hinata could use her Byakugan to scout ahead and Kiba with Akamaru by his side could provide support from the flanks.
Perhaps in the story, there is a competition for a rare ninja item or a special mission opportunity. Kiba, being very competitive, sees Hinata as a threat. He tries to intimidate her by making fun of her skills in a very mean way. Hinata, who is already a bit shy and self - conscious, is deeply hurt by Kiba's actions. Naruto, on the other hand, witnesses this and stands up for Hinata, which then starts a whole new plot development in the fanfiction.
Hinata would be heartbroken at first. Naruto is someone she deeply cares about. But she's also a strong - willed ninja. So she might start by trying to understand why Naruto left. She could look for clues in the village or talk to Naruto's friends to figure out his possible destination.
I really liked 'A Different Perspective'. In this fanfic, it shows how Kiba's unique view of Hinata might change the way she sees herself. It delves into their characters more deeply and has some really nice character interactions. It's not just about romance but also about their growth as shinobi.
Often, they could be on a team in a tournament setting. Facing off against other teams to prove their skills and win a prestigious prize. Or it could be a rescue mission to save someone important.
A fanfiction could be about a race. Naruto, Hinata, and Kiba enter a village - wide race. Naruto is confident in his speed and agility. Hinata is determined to prove herself. Kiba, with Akamaru, thinks they have an advantage. The race has different obstacles like rivers and trees. Naruto might use his shadow clones to get through some parts faster. Hinata could use her gentle fist to jump higher over obstacles. Kiba and Akamaru could use their tracking skills to find shortcuts. In the end, it doesn't matter who wins but the lessons they learn about themselves and each other during the race.
I'm not sure if there is a particularly popular 'hinata cheats on naruto with kiba fanfiction'. Fanfiction varies greatly in popularity and quality. Some might find such a plotline unappealing as it goes against the original relationships in the Naruto series. However, in the vast world of fanfiction, there could be some out there, but it's not something that is mainstream or widely known to be super popular.
He would be filled with rage. Naruto has a strong sense of justice and the fact that someone took Hinata away from him would fuel his anger. He would vow to find and punish whoever was responsible. He might even become reckless in his pursuit of vengeance, endangering himself and those around him. His friends would have to step in to try and bring him back to his senses.