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.
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.
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.
Definitely Legolas and Will Turner. Legolas with his amazing archery skills could teach Will some new techniques, and Will could show Legolas the ropes of being a pirate. They both have a sense of honor and loyalty, so they would make an interesting duo.
A lesser - known but excellent piece is 'Ringbearer Buffy'. Here, Buffy is somehow made into a ringbearer. It's a unique take on both franchises. The story delves deep into how Buffy's personality and her experiences as a slayer would affect her role in the quest to destroy the One Ring. It has some great character development and some really intense action scenes.
I think Naruto and Frodo would be really interesting. Frodo has this burden of the One Ring and Naruto has his own struggles with the Nine - Tailed Fox. They could bond over their heavy responsibilities and Naruto could use his skills to protect Frodo on his journey.
Naruto and Aragorn would be an interesting pairing. Naruto is a young hero full of energy and determination, while Aragorn is a battle - hardened and noble leader. They could learn a great deal from each other. Naruto could show Aragorn his unique ninja skills, and Aragorn could teach Naruto about leadership and honor.
In a Harry Potter and LOTR crossover fanfiction, black magic could take on different forms. In the Harry Potter universe, it's often associated with the Dark Arts like the Unforgivable Curses. In LOTR, dark magic is related to Sauron and his minions. A crossover might explore how wizards from Harry Potter's world react to the more ancient and malevolent black magic of Middle - earth.
Sesshomaru's speed and agility would be a great asset in Middle - earth. He could easily outrun orcs and other foes. His sword, Tenseiga, which has the power to resurrect, could also have an interesting impact. For example, if he were to use it on a fallen hero, it could change the course of a battle.
The main appeal is the combination of two very different but beloved universes. Buffy's world is modern, full of vampires and demons, while LotR is a high - fantasy epic. When they cross over, it creates a whole new set of possibilities. For example, seeing Buffy fight Orcs or Aragorn dealing with vampires is really exciting.