Yes, there could be such fanfictions. Fanfiction allows for a wide range of creative interpretations. Some writers might deviate from the original characters' traits and create a story where Hinata cheats on Naruto. But this is not in line with the general perception of their relationship in the original series.
One possible fanfiction scenario could be that Hinata, Sasuke and Naruto are on a difficult mission together. They start off with some tension due to Sasuke's past actions. However, as the mission progresses, they learn to trust each other more. Hinata might use her gentle nature to ease the situation between Naruto and Sasuke. Naruto's determination and Sasuke's skills combine with Hinata's support to make them a formidable team in this fictional adventure.
Well, one possible scenario could be that in this fanfiction, Naruto discovers Mikoto is pregnant and he takes on the role of a very protective friend. He might help her with daily tasks, like getting groceries or just being there for emotional support. Naruto's own experiences growing up without parents could make him extra determined to ensure Mikoto has a smooth pregnancy.
In many fanfictions, if Sakura were to be pregnant, it could be a very complex situation. If Naruto was the father, it would be a huge shift in their relationship dynamic. Naruto's carefree nature might change as he takes on the responsibility of fatherhood. He would be excited and probably vow to protect his new family with all his might. Sakura, on the other hand, would be a very protective mother, using her medical skills to ensure a healthy pregnancy.
I'm not sure specifically which one is the absolute longest. There are many great alternate scenario Naruto fanfics out there. You could try searching on popular fanfic platforms like FanFiction.net or Archive of Our Own. They have extensive collections and you can usually sort by length to find some of the longer ones.
One idea could be Naruto using his shadow clones to distract the zombies while he and his team find a safe place. Maybe he discovers a new jutsu that can control the zombies instead of just defeating them.
Naruto's reaction could be complex. He might be sad and disappointed, but he also has a lot of love in his heart. He could try to forgive his teammates, believing that there must be some misunderstanding. However, if they continue to oppose him, his reaction would turn more towards self - preservation and growth. He would focus on his own development, both as a ninja and as a person. He would use this betrayal as a motivation to become stronger, all while still hoping that one day he can reconcile with Team 7.
There could be a fanfic where Naruto has to go on a long - distance mission. Hinata is worried about him. Right before he leaves, she runs up to him and hands him a handmade charm for good luck. Naruto is touched. He pulls her into an embrace and then kisses her gently on the lips, marking their first kiss. It's a bittersweet moment as he then has to leave on his mission.
It could be. Naruto has always looked up to Tsunade. In fanfiction, this could be twisted into a romantic relationship. Tsunade is a powerful and alluring character. Naruto, with his big heart, might find himself falling for her. However, it would be a complex relationship considering their age difference and the power dynamics at play. But in the realm of fanfiction, all these elements can be explored and molded into a believable love story.
One idea could be a story where Fem Naruto is on a mission and Male Sakura, who has developed his own unique medical - ninjutsu skills, has to go and rescue her. Maybe there's a powerful enemy that has trapped Fem Naruto, and Male Sakura uses his intelligence and new jutsu to fight through and save her. It could also be a story about their relationship development, starting from being rivals in the ninja academy to gradually falling in love as they face various challenges together in the shinobi world.