A third plot idea could be a tournament - style fanfic. Characters from both Naruto and Fairy Tail participate in a grand tournament held in a neutral dimension. There would be rules that allow both ninja and magical attacks. The story could focus on the different strategies the characters use, the friendships that form between competitors, and the overall excitement of the tournament, all while being suitable for all audiences.
Another idea is that Zelda characters find themselves in the Naruto world. They could get involved in the ninja academy and learn about chakra. Maybe Zelda herself could try to master some of the ninja arts and use her magic in combination with it. This would lead to a lot of interesting interactions between the Zelda characters and the ninja students.
One plot idea could be a training arc. Naruto could teach Illya some basic ninja skills like stealth or tree - climbing, while Illya could show Naruto some of her magic spells for defense. Another idea is a mystery - solving plot where they team up to figure out why strange things are happening in both their worlds. For example, strange creatures are appearing in Konoha and in Illya's town that seem to be related.
One plot idea could be a female Sasuke who uses her unique skills in a different way than the male Sasuke in the original. For example, she might focus more on diplomatic solutions to problems in the ninja world, using her intelligence and combat skills to broker peace treaties.
A fanfiction could be about Naruto starting a ninja academy in a small, war - torn village. He uses his own experiences and teachings from his masters like Jiraiya to train a new generation of ninjas. It could explore how he imparts values like friendship, hard work, and perseverance to the young students.
One plot idea could be that Naruto and Wonder Woman meet when a strange rift in the multiverse opens up. They have to work together to close the rift while also dealing with the fact that their powers work very differently. Naruto could show Wonder Woman his ninjutsu, and she could introduce him to the concept of the Gods in her world.
One plot idea could be that Naruto gets transported to the world of Equestria. Princess Celestia senses his strange power and they start to communicate. Naruto helps the ponies in Equestria deal with a new threat using his ninja skills, and in return, the ponies teach him about their magic. It could be a story of friendship and cultural exchange.
A plot could also be where Naruto is wrongly accused of being a succubus - like being a danger to the village because of some strange powers he has. Kushina, even though she has passed away, appears to Naruto in his mind or as a spirit guide. She gives him the strength and wisdom to prove his innocence and show that his powers can be used for good, rather than being seen as something evil like a succubus.
Perhaps in this fanfiction, Naruto and Korra find themselves in a situation where their pregnancies are part of a prophecy. They then have to figure out how to fulfill the prophecy while dealing with the normal challenges of pregnancy like mood swings and physical discomfort. They could meet other characters from their respective universes who help them on this journey, like Kakashi guiding Naruto on how to be a good father - to - be and Tenzin giving Korra advice on handling her new situation.
One idea could be that Naruto and Captain Marvel are brought together by some sort of interdimensional rift. They have to figure out how to get back to their respective worlds while also dealing with threats in the new world they are in. Maybe they have to combine their powers, like Naruto's shadow clones and Captain Marvel's energy blasts, to defeat a powerful villain.
It could be about Wendy's vulnerability. For example, she might be in a situation where she loses her magical powers temporarily and feels 'naked' in a sense, as her powers are a big part of her identity. The story could then focus on how she overcomes this and regains her confidence.