For a 'naruto training crossover fanfic', you could do a crossover with the Bleach universe. Naruto could train with Ichigo. Ichigo's ability to transform and his sword skills could inspire Naruto to develop new jutsu. Also, Naruto's stamina and willpower could be an example for Ichigo. Another option is to cross Naruto with characters from Hunter x Hunter. The nen abilities in Hunter x Hunter are complex. Naruto could learn about nen and use some concepts to enhance his chakra usage. And the Hunters could learn about ninja stealth and combat from Naruto. Maybe Naruto could also train with Killua, and they could have a friendly sparring match to exchange skills.
One idea could be to have Naruto train with characters from other popular shonen series like Goku from Dragon Ball. They could exchange training techniques, for example, Naruto teaching Goku about chakra control while Goku shows Naruto how to better use his physical strength. Another idea is to have Naruto cross over with characters from Fairy Tail. The Fairy Tail mages could introduce Naruto to different types of magic-based training that he could incorporate into his ninja training. A third idea would be to have Naruto train with characters from One Piece. They could have a unique training session on a deserted island, learning survival skills from each other.
Well, in a 'naruto training crossover fanfic', a really cool crossover would be with the Avatar: The Last Airbender world. Naruto could train with Aang. Aang could teach Naruto about bending the elements, and Naruto could show Aang some of his ninja techniques. They could both learn about different ways of using their powers. Also, Naruto could cross over with the characters from My Hero Academia. The students at U.A. High could introduce Naruto to modern hero training methods, and Naruto could teach them about the importance of self - discipline and hard work in training, which are key aspects of his own training journey.
Another interesting idea is to put Naruto in a training exercise where he has to team up with his former enemies. Like having him train with Sasuke's old followers. They could learn from each other's skills and Naruto could also understand their perspective better, adding depth to the relationships in the fanfic.
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.
A third idea could be a crossover with a dystopian empire. The shinobi would face a much harsher and more controlling regime. This could lead to some really intense storylines as they try to either overthrow the regime or find a way to co - exist within it.
Perhaps there could be a common enemy that both Inuyasha and Naruto have to face. A powerful demon or a rogue ninja who has found a way to travel between their worlds. They would have to combine their unique skillsets, like Inuyasha's speed and strength along with Naruto's Rasengan and his ability to inspire others. Their friends would also play important roles, like Sakura helping with medical needs and Kagome providing spiritual support.
A cool concept for a 'naruto fate crossover fanfic' could be the appearance of the Akatsuki in the Fate world. They might be after the Holy Grail for their own purposes, like using it to gain ultimate power or to bring about a new world order. Pain could use his Rinnegan abilities in ways that would surprise the Fate characters. Also, the concept of ninjas from Naruto world learning about the different classes of Servants in Fate, like Saber, Archer etc., and how they would strategize against them.
One idea could be to have Naruto gain the Berserker's rage ability. Picture him in a battle, his eyes turning red as he taps into this newfound power, making his attacks more ferocious and unpredictable. It would add a whole new dimension to his fighting style.
One interesting plot idea could be that during training, Naruto discovers a new jutsu on his own. He might be trying to perfect his Rasengan and accidentally combines it with his shadow clone technique in a unique way. This new jutsu could give Team 7 an edge in future battles.
Well, a great plot for a Naruto Uchiha crossover fanfic could be centered around time travel. Imagine Naruto going back in time and trying to prevent the Uchiha massacre. He could use his knowledge of future events and his own unique skills to change things. Or perhaps an Uchiha character, say Sasuke, gets sent to a future where Naruto has become Hokage and they have to work together to solve a new, greater threat to the ninja world that is beyond what they've faced before. There could also be a plot where Naruto and an Uchiha are magically bonded and have to share their emotions and powers, which leads to a whole new dynamic in their relationships and how they face challenges.
A really cool idea for this crossover fanfic could be a fusion of powers. For example, what if Zoro got some of Sasuke's Sharingan abilities? He could use it to predict his opponents' moves even better. On the other side, what if Nami got some basic ninjutsu skills like the Clone Technique? She could use it to trick pirates while stealing their treasure. Also, the story could be about a search for a special item that has significance in both worlds. This item could be a key to unlocking a powerful force that could change the balance of power in both the Naruto and One Piece universes.
One idea could be Naruto being reborn into the world of One Piece. He could use his ninja skills to navigate the Grand Line. Maybe he'd form an alliance with the Straw Hat Pirates and teach them some unique jutsu in exchange for learning about Haki.