In a 'naruto goes to koyuki fanfic', perhaps Naruto is invited to Koyuki's place for a cultural exchange. Naruto, being the curious and friendly ninja he is, gets to experience the unique traditions and way of life in Koyuki's territory. Along the way, he shares his own ninja world experiences, and they bond over their differences and similarities. And there could be some action too when some anti - peace forces try to disrupt the exchange.
Well, it could be about Naruto going on a mission to Koyuki's land. Maybe he has to protect her from some new threat that has emerged in her kingdom. He might use his ninja skills to fight off the bad guys and in the process, he and Koyuki could develop a deeper friendship or understanding of each other.
In a 'Naruto Koyuki married' fanfiction, the plot could start with Koyuki being in danger and Naruto saving her. This leads to a deepening of their relationship and they decide to get married. After marriage, they work together to improve the lives of the people in Koyuki's country. Naruto teaches the people some ninja techniques for self - defense, and they also have to deal with threats from other ninja clans who are jealous of their power and influence as a married couple.
Obviously, Koyuki herself would be a main character to interact with Naruto. She might show him around her place, introduce him to her people. Also, any of her loyal guards or advisors could interact with Naruto. They could be initially suspicious of him but then grow to trust him as they see his good intentions.
Maybe Naruto goes to hell to rescue a friend or to face some powerful dark forces. For example, he might go to save Sasuke who got trapped there somehow.
In a 'naruto goes rogue' fanfic, the plot could involve Naruto feeling betrayed by the Hidden Leaf Village. Maybe he discovers some dark secrets about the village leaders. For example, he might find out they were using him all along. So, he decides to break away and form his own group of outcasts who also felt wronged by the village.
Well, one possibility is that Naruto arrives at Beacon and his ninja skills make him stand out immediately. He could befriend Ruby and the others quickly, and they'd be amazed by his shadow clone jutsu. Maybe he'd help them train in new combat styles.
One possible plot could be that Naruto is framed for a crime he didn't commit. Maybe someone with a vendetta against him plants false evidence. In prison, he would have to deal with tough inmates and the strict prison regime while trying to prove his innocence.
Well, it could be about Naruto going on a spiritual journey to meet Kami. Maybe he's seeking some sort of power or knowledge that only Kami can provide. He might face various challenges along the way, like powerful spirits or difficult terrains.
Well, it could be about Naruto arriving at Hogwarts and being confused by all the magic there. Maybe he tries to use his ninja skills in a world full of wizards and witches.
One possible plot could be that Naruto is pushed over the edge by the constant betrayal he faces. For example, if the village he has always protected turns against him due to false accusations of being a threat. He might start using his powers in a more erratic and dangerous way, not caring about the consequences. This could lead to a showdown between him and his former friends who now see him as a menace.
Well, in a 'naruto goes goth fanfic', perhaps Naruto has an encounter with a powerful and dark entity. This entity influences him to embrace the goth aesthetic. He could start using different jutsu that have a darker, more menacing look. His friends might be initially shocked but then try to understand what led him to this change. He might even change the look of his home to be more gothic, with dark curtains and spooky decorations.