A good Naruto Fate crossover fanfiction often has a well - thought - out plot that combines the unique elements of both universes. For example, integrating the chakra system from Naruto with the magic and Servant system of Fate in a logical way. It also needs to keep the characters in - character. Naruto should still be the determined and somewhat naive ninja we know, while the Fate characters should retain their own personalities.
It could be Naruto. His ability to use chakra and his vast array of jutsus are very powerful. In the Fate universe, he might be able to combine his chakra with the magic there. For example, he could infuse his Rasengan with magical energy, making it even more destructive.
One idea could be that Naruto is summoned into the Fate universe during the Holy Grail War. He might be mistaken for a Servant at first. His unique ninja abilities would disrupt the normal flow of the war. For example, his Shadow Clone Jutsu could be used to confuse the enemy Masters and Servants.
There's also 'Fate/Naruto: The Grail War in Konoha'. In this fanfic, the concept of the Holy Grail War is set in the Hidden Leaf Village. Characters from Naruto start to form contracts with Servants. It's really interesting to see how Sasuke might interact with an Archer - class Servant, for example, and how their combined abilities are used in the context of the Naruto universe.
It's really hard to say who would be the most powerful. On one hand, in Fate Stay Night, Servants like Gilgamesh have incredible power. His Gate of Babylon contains countless noble phantasms. But in the Naruto world, characters like Naruto in his Six Paths Sage Mode are also extremely powerful. He has the power of the tailed beasts and can use all kinds of powerful jutsu. However, if we consider a crossover, it might be someone who can combine the powers from both worlds. For example, if a mage from Fate could learn to use chakra and combine it with their magic, they could be very powerful. Or if Naruto could somehow gain the abilities of a Servant, like the ability to use noble phantasms, he would be unstoppable.
One idea could be to explore how Hercules' incredible strength affects the Fate universe. Maybe he is summoned as a Servant in a Grail War and his brute force challenges the traditional battle strategies of other Servants. His Twelve Labors could also be incorporated in some way, like each Labor being a trial he has to face within the context of the Fate story.
A third idea is a crossover where the characters from both universes have to team up to face a common enemy. Maybe an ancient evil that threatens both the world of Fate and the DxD world. They would need to combine their powers and strategies, like the devils using their demonic powers along with the Servants' unique abilities.
Yes, there might be. The Fate series and Naruto both have large fan bases, and crossovers are quite popular among fans. Some creative fans may come up with the idea of combining elements from Fate Apocrypha and Naruto while also including a god - like figure in their fan - made stories.
One great 'Fate Servant Crossover Fanfiction' is 'Fate/Grand Order and the World of Harry Potter'. It combines the magic of the Harry Potter universe with the unique Servants from Fate. The story often has interesting battles where Servants use their powers in the Hogwarts setting. Another one could be the crossovers with the Naruto world. Here, Servants might face off against ninja techniques, creating a whole new dynamic of power clashes.
Another concept is a more comical crossover. Shirou tries to adapt to the different rules and magic in the Fate Apocrypha world. He constantly gets into funny situations as he misunderstands the local customs and magic systems. For example, he tries to cook using Apocrypha - style magic ingredients and chaos ensues.