Naruto might be shocked at first. He could stand there frozen, unable to believe what he's seeing. His face would probably show a mix of confusion and hurt.
Naruto could also be very mature about it. He might realize that there could be more to the situation than what he sees. So, instead of jumping to conclusions, he stays calm and tries to find out the real story behind Hinata's kiss.
He could react with anger. Naruto might think that Hinata has betrayed him in some way, even if they're not officially together. He might storm off and then later come back to demand an explanation from Hinata.
He would be filled with a deep sense of grief. Naruto has always cared about Hinata, and her death would be like a part of him has been ripped away. He might isolate himself for a while, blaming himself for not being able to protect her. But eventually, he would use his pain as motivation to get stronger and fight against whatever caused her death.
Hinata might be very hurt. She's a sensitive person, so Naruto yelling at her could make her feel small and sad. She might start to doubt herself and her abilities.
One possible plot twist could be that Hinata is kissing someone as part of a mission. Maybe she has to pretend to be in love with a character to gain information. Naruto, seeing this, initially misunderstands but then later discovers the truth and respects Hinata's dedication to the mission.
The village would likely be very happy. Naruto is a hero to them, and Hinata is from a respected clan. People would see it as a positive sign of new beginnings after the war. The children might look up to them even more, seeing a real - life love story unfold. Some might even throw a small celebration in honor of their relationship.
Naruto might become more competitive. For example, if he sees Hinata spending time with someone else, he'll try to outdo that person in various tasks, like training or helping villagers. He could also get moody and a bit withdrawn, not his usual energetic self. It's his way of dealing with the unfamiliar feeling of jealousy.
He might become really withdrawn. Naruto is a very emotional person, so if Hinata breaks his heart, he could isolate himself from his friends and the village. He would probably be too hurt to face them.
There are probably some. Fanfic writers often explore the relationship between Naruto and Hinata in different ways. They might write about their first kiss, or a romantic moment where a kiss occurs. However, the quality and content can vary greatly among different fanfics.
Naruto would probably be extremely hurt. He has always considered Hinata a friend and perhaps more. Betrayal from her would be a huge blow to his trusting nature. He might initially be in denial, not wanting to believe that Hinata could do such a thing.
Naruto might be overjoyed. He's always been someone who values friendship and love, and Hinata's confession could be like a dream come true for him. He could immediately accept her love and start planning a future together.
Hinata would be overjoyed. She has loved Naruto for a long time, so his proposal would be like a dream come true for her. She might start crying tears of happiness and immediately say yes without hesitation.