Sure, it could work. Imagine Naruto finding a mysterious scroll during one of his adventures. This scroll contains ancient knowledge that allows for the summoning of beings from other realms. He experiments with it and, by some twist of fate, manages to summon Mordred. It would be a very interesting scenario as Mordred's combat skills and personality would clash and also blend with Naruto's world of ninjas.
Well, in a fanfic, anything is possible. Naruto's summoning jutsu typically calls upon toads. But if he were to summon Mordred, it could be through some kind of cross - over magic. Maybe a powerful mage in the Naruto world creates a link between their universes. Or perhaps Naruto discovers a new type of chakra that can interact with the magic that Mordred is associated with.
One possible plotline could be about their relationship reconciliation. Maybe Mordred realizes the true nature of her actions and tries to seek forgiveness from Artoria. They could have a series of adventures together where they gradually understand each other better.
Well, in fanfics, anything can happen. Maybe it's some kind of magic or alternate universe thing that makes Naruto end up as Mordred's father. It could be that a powerful wizard or some strange force manipulated events to bring them together in this unexpected family relationship.
In a Naruto becomes immortal fanfic, it could be possible through some unique jutsu. Maybe he discovers a long - lost forbidden jutsu that halts the aging process. For example, he might find a scroll in an ancient ruin that contains the knowledge of immortality. Another way could be through some sort of pact with a powerful and immortal being. This being could grant Naruto immortality in exchange for a great service or sacrifice.
If Naruto lost all his friends in a tragic way, perhaps in a large - scale attack on the village where he couldn't save them despite his best efforts. The grief and guilt could consume him and change his values. He might start to think that the shinobi world is cruel and needs to be changed by force, which would lead him to become a villain in the fanfic.
It's possible in the realm of fanfiction. Adamantium claws are a well - known feature from the X - Men universe. In a Naruto fanfiction, it could be that some sort of cross - over event or a powerful ninja technique gone wrong/right led to Naruto having these claws. Maybe a rogue ninja with strange powers or a forbidden jutsu experimented on Naruto and accidentally gave him adamantium - like claws. This would completely change his fighting style, as he'd have a new close - range weapon in addition to his regular ninjutsu.
Well, on the surface, Naruto and Batman seem like two very different characters from different universes. But in fanfiction, anything can be possible. Maybe they could be brothers if there was some sort of multiverse crossover. For example, if there was a dimension where the shinobi world and Gotham City co - existed. Naruto's values of loyalty and never giving up could blend well with Batman's determination. However, it would be a very strange combination considering Naruto's bright and energetic nature compared to Batman's brooding and dark persona.
A Naruto and Godzilla fanfic could work by finding a common ground for their powers. For example, Naruto's chakra can be compared to the energy that Godzilla emits. They could either be in conflict because of different uses of this energy or they could work together to harness it for a greater good.
Well, in a fanfiction context, it's possible through creative liberties. Maybe some sort of alternate universe where the X - Men world and Naruto's world collide in a way that Jean Grey has a connection to Naruto's birth. It could involve some kind of time - travel or cross - dimensional magic. However, it's a very strange combination as the two universes have different rules and power systems.
One possible plot could be that Naruto discovers a new and ancient summoning contract that allows him to summon Mothra. Mothra's appearance in the Naruto universe could cause chaos among the ninja villages as they've never seen such a creature. Naruto would have to learn how to control and work with Mothra to protect his village from new threats.
If Naruto summons Gilgamesh, one interesting aspect would be the clash of their personalities. Naruto is all about friendship and protecting his village, while Gilgamesh is a self - centered king. However, Naruto's positive attitude might gradually change Gilgamesh's view. In battles, Gilgamesh could use his Gate of Babylon to rain down powerful weapons, and Naruto could use his shadow clones to create diversions. They could combine their strategies in a unique way to defeat their foes.