One possible plot could be that Naruto and his friends are somehow transported to Middle - earth. Naruto, with his never - give - up attitude, could inspire the hobbits on their journey. Maybe Naruto's chakra could be seen as a new form of magic in Middle - earth. His shadow clones could be used to confuse the orcs, just like how they confuse his enemies in the Naruto world. And the characters from LotR could learn about the concept of ninja and their unique skills from Naruto and his comrades.
Well, imagine that the One Ring has a strange connection to the chakra in Naruto's world. The Fellowship discovers that Naruto has a unique ability to resist the ring's power due to his strong will and chakra control. So they ask for his help in destroying the ring. Along the way, Naruto teaches the hobbits some basic self - defense ninja moves.
A possible plot is that Conan is brought to Middle - earth by a powerful magic accident. He lands in the Shire and is initially confused by the hobbits' way of life. But when he learns about the threat of Sauron, he decides to help. He teams up with Aragorn and they form an unlikely duo. Conan's no - nonsense attitude and Aragorn's leadership skills complement each other as they lead an army against Sauron's forces.
One idea could be that the One Ring somehow ends up in the world of Pirates of the Caribbean. Jack Sparrow, being the wily character he is, gets wind of its power and decides to either use it for his own gain or sell it to the highest bidder. The Fellowship, in turn, has to track it down in this strange new world full of pirates, sea monsters, and cursed treasures.
Another plot could involve the Rings of Power in LOTR having some sort of connection to the magic in Narnia. For example, the White Witch might be interested in obtaining the One Ring to increase her power. This could lead to a conflict where the forces of good from both Narnia and Middle - earth have to join together to stop her. The different races in both worlds, such as the hobbits, dwarves, elves in LOTR and the talking animals in Narnia, could interact in unique ways during this conflict.
One idea could be Sesshomaru arriving in Middle - earth in search of a powerful relic. He might cross paths with Aragorn and initially be seen as a threat. Another could be that he forms an alliance with the elves, as they both have an air of elegance and long - lived existence. Maybe he gets involved in the battle against Sauron, using his demonic powers in a way that surprises both friend and foe.
One plot idea could be that the One Ring somehow finds its way into the X - Men universe. Maybe Magneto senses its power and wants to use it for his own purposes, believing it could give him ultimate control over mutants and humans alike. The X - Men, on the other hand, realize the danger of the Ring and try to stop Magneto from getting his hands on it. Another idea is that some of the LOTR characters are reincarnated as mutants. For example, Aragorn could be a mutant with enhanced leadership abilities and physical prowess, and he teams up with the X - Men to fight a common enemy that threatens both Middle - earth and the mutant world.
Well, perhaps in this fanfiction, the SAO system is corrupted by an Orochimaru - like figure. He wants to use the virtual world to gain power and immortality. Naruto and his friends, along with the SAO players, have to team up. Naruto's positive attitude and never - give - up spirit inspire the SAO players. They all work together to defeat this new threat, with Naruto using his Rasengan in new and creative ways within the SAO world.
A plot could involve the Killzone characters getting access to chakra. Some of the Killzone soldiers might start to learn ninjutsu and this causes chaos in their own military structure. Meanwhile, Naruto has to figure out how to get back to his own world while also dealing with the new threats that this crossover has created. Maybe he teams up with some of the more honorable Killzone soldiers to find a solution.
A plot might involve Naruto being sent to Bayonetta's world. He'd be out of his element, but his determination would shine through. Bayonetta could mistake him for a strange demon at first. However, they soon realize they can help each other. Naruto's chakra could interact in unexpected ways with Bayonetta's magic. Together, they could face off against Bayonetta's foes, like the angels, with Naruto's Rasengan combined with Bayonetta's Witch Time abilities making for some epic battles.
In a Naruto and Spiderman crossover, it could start with Spiderman noticing some strange energy signatures in his city. These turn out to be Naruto's chakra flares. Naruto is there looking for a way back to his own world after being accidentally sent to Earth - 616 (the Marvel Universe). They meet and at first don't understand each other. However, when they see a common enemy, a group of ninjas - like mutants who are causing chaos, they decide to work together. Spiderman uses his agility and web - shooting while Naruto uses his jutsu to defeat the bad guys.