The plot might involve Naruto falling in love with a character from a different story within the fanfiction. He could teach that character about his ninja way of life, and in turn, learn about love from them. Their relationship could develop as they face challenges together, like fighting off enemies that are against their relationship or dealing with cultural differences between Naruto's world and the new world.
Perhaps in this crossover, Naruto is tasked with helping a group of characters understand the true meaning of love. He uses his own experiences of losing and gaining friends, and his unwavering belief in his comrades, to teach them. Along the way, he might also discover new aspects of love that he hadn't considered before, such as romantic love, which could be a whole new adventure for him as he's always been more focused on his ninja duties.
A character from the 'lessons in love' universe could be the main character as well. For instance, a character who is an expert in love but knows nothing about the ninja world. This character could meet Naruto and be intrigued by his way of life. As they interact, they both learn from each other. Naruto learns about different forms of love from this character, and the character learns about courage, loyalty and friendship from Naruto.
One possible plot could be Naruto, with his godlike powers, getting transported to the To Love Ru universe. He might end up helping Rito in his harem - related misadventures, using his ninja skills. For example, Naruto could use his shadow clone jutsu to handle multiple tasks at once, like helping with school events while also protecting the girls from various threats in the To Love Ru world.
Well, in a Naruto and Thor crossover fanfic, maybe Naruto is on a journey and accidentally stumbles into a portal that leads him to Asgard. There, he meets Thor. Thor is intrigued by Naruto's tenacity and ninja skills. They could exchange their combat techniques. Naruto shows Thor how to move stealthily like a ninja, and Thor teaches Naruto some of his Asgardian battle tactics. And together they could face a threat to Asgard that is related to some dark chakra - like magic that has seeped into Asgard from another dimension.
One possible plot could be that Naruto goes on a mission to the Hidden Cloud Village where he meets Samui. They are initially at odds due to the historical tensions between their villages. But as they face a common enemy, like a rogue ninja group trying to steal a powerful jutsu from both villages, they start to work together. Naruto's determination and positive attitude gradually influence Samui, and they form an unlikely friendship that might even lead to a deeper understanding between the Leaf and Cloud villages.
Perhaps it could be a story of redemption for Lucifer. Naruto, with his unwavering belief in the good of people, sees something in Lucifer that could be saved. He tries to convince Lucifer to turn away from his more evil tendencies. Along the way, Naruto has to face challenges in Lucifer's world, and Lucifer has to face his inner demons as Naruto encourages him to change.
One possible plot could be that Tony Stark, while testing some new interdimensional tech, accidentally ends up in the Naruto universe. He could use his advanced technology to help the ninja in various ways, like creating new weapons or defenses against the Akatsuki. Maybe he teams up with Naruto and they combine their powers to defeat a common enemy, such as a new super - powerful villain that neither world could handle alone.
Well, one possibility could be that Naruto somehow gets transported to the world of Tangled. Maybe he teams up with Rapunzel to fight off some common enemies. For example, the bad guys in Tangled might be after Rapunzel's magic hair for some evil purpose, and Naruto's ninja skills could come in handy to protect her. He could use his shadow clone jutsu to create distractions while Rapunzel uses her hair to swing around and attack.
One possible plot could be that Naruto is on a mission in a desert area and accidentally stumbles upon an ancient tomb where the mummy resides. The mummy, having some sort of ancient and powerful chakra, senses Naruto's own chakra and mistakes him for an intruder or a threat. Naruto, being Naruto, tries to communicate and figure out what's going on instead of immediately attacking. This could lead to a series of events where they have to team up against a common enemy that is after the mummy's power and Naruto's unique abilities.
Well, one possible plot could be that Supergirl accidentally lands in the Naruto universe. Naruto, being the curious and friendly ninja he is, approaches her. They initially have a misunderstanding due to their different worlds and powers, but then they realize they can learn from each other. Supergirl could teach Naruto about her advanced technology from her world, while Naruto could show Supergirl the unique chakra - based powers and the ninja way of life.
In this type of fanfiction, it could start with a strange magical artifact in the Naruto world that has a connection to the Rosario world. When Naruto touches it, he and some of his comrades are transported to the Rosario world. There, they are mistaken for enemies at first. But as they show their good intentions, they start to work together with the Rosario characters. They might learn about different forms of power like the Rosario vampires' unique abilities and combine them with their own ninja skills to face challenges in this new world.