Well, perhaps in the fanfic, Naruto and Yoruichi are brought together by a mysterious force that binds their destinies. They might start off as strangers but gradually learn to trust and rely on each other. For example, Yoruichi could be on a mission in the Naruto world and Naruto helps her out. In return, she offers to train him in stealth and agility, skills she is highly proficient in.
In a 'godlike naruto x yoruichi' fanfiction, Naruto could be on a quest to master a new form of his power. He meets Yoruichi, who has knowledge of unique energy forms. She decides to help him, and during their training sessions, they develop a deep bond and fall in love.
One idea could be that they start training together more often and during these sessions, they gradually discover their feelings for each other. Yoruichi might see Ichigo's growth and determination in a new light, and Ichigo could be attracted to Yoruichi's mysterious and powerful nature.
Another interesting concept could be a story about Naruto visiting Starfire's world. He could be amazed by the different technology and culture there, while Starfire is intrigued by Naruto's ninja skills and his chakra.
Well, you could have a fanfic where the Pokemon regions are somehow connected to the Hidden Villages in the Naruto universe. For instance, the Leaf Village could be near the Kanto region. And then there could be a plot where a new type of threat emerges that requires the combined efforts of both Pokemon trainers and ninjas. Also, characters from both series could swap abilities. Imagine Sasuke using Pikachu's Thunderbolt or Ash using Sharingan to predict his opponents' moves in Pokemon battles.
Another idea is a 'what - if' scenario. For example, what if Boruto was raised in a world where Naruto had failed to become Hokage? This could lead to a very different Boruto, perhaps more cynical or desperate to change the world on his own. The fanfic could explore how he would grow up and try to fix the situation his father couldn't.
A Naruto x One Piece crossover would also be cool. Naruto could end up on the Grand Line and team up with the Straw Hat Pirates. His ability to create shadow clones could be useful in battles against other pirates, and he might learn some new skills from Luffy and the crew.
One idea could be a crossover where Naruto's world and the world of X - 23 from the X - Men collide. Maybe X - 23 is on a mission and accidentally ends up in the Hidden Leaf Village. She has to learn to adapt to this new place with its different culture and ninja ways. Naruto could be intrigued by her and her abilities, and they could team up to face a common enemy.
One idea could be that Naruto discovers a dragon egg during one of his missions. As he nurtures the egg, he forms a unique bond with the dragon when it hatches. The dragon could have special powers that help Naruto in his battles against powerful foes.
One idea could be a crossover tournament where Naruto and Goku both participate. They start as rivals but gradually come to respect each other's skills. Another could be that they have to team up to face a common enemy from both of their universes combined. Maybe a powerful demon or an evil entity that has the ability to use both ninja techniques and ki powers.
One idea could be a crossover where Goku and Naruto are brought to a strange new dimension together. They have to team up to fight a powerful villain that neither of their worlds has ever seen. Their different fighting styles, Goku's ki - based attacks and Naruto's ninjutsu, would make for some really cool battle scenes.