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.
To start writing an asoiaf crossover fanfic, begin by choosing the crossover element carefully. Are you going to cross it with a modern - day setting or another fantasy world? Once you've decided, do research on both. For example, if it's a crossover with a superhero universe, learn about the powers and ethics of the superheroes. Then, create an engaging character from one of the worlds who will be the catalyst for the story. Start with a strong opening scene that shows the contrast between the two worlds.
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.
One interesting 'asoiaf crossover fanfiction' could be a crossover with the Lord of the Rings universe. Picture Jon Snow in Middle - earth, facing the orcs. Another could be a crossover with the Harry Potter world, like Daenerys Targaryen using magic in Hogwarts. And there might be one where Arya Stark travels to a different fantasy realm and uses her assassin skills there.
Some great asoiaf crossover fanfic ideas involve crossovers with historical settings. For example, a crossover with ancient Rome where the politics and power struggles are compared. Or a crossover with Victorian England, introducing the social norms and class differences into the world of asoiaf. There could also be a crossover with Japanese samurai culture, creating unique battles and honor codes within the asoiaf universe.
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.
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.
Some 'lotr crossover fanfic' stories involve crossing over with modern - day settings. For example, a story where a modern - day person gets transported into Middle - earth. In these crossovers, they might introduce modern technology or ideas into the LOTR world. There are also crossovers that blend LOTR with other high - fantasy worlds like 'Dragonlance', creating new and exciting adventures that combine the unique elements of both universes.
One challenge is staying true to the complex world - building of ASOIAF. The lore is so detailed that any deviation might seem out of place. Also, making the OC believable and not too overpowered can be tough.