In a Pirates of the Caribbean fanfiction, Ruby could be seen as a sort of chosen one. Her innocence and determination could be what's needed to break a powerful curse. Weiss might form an unlikely alliance with a crusty old pirate who teaches her the ropes of the sea. Blake could discover a hidden community of Faunus - like beings in the Pirate world, and Yang would befriend some of the rowdiest pirates and show them that there's more to strength than just brute force.
The ponies' personalities can be adapted to fit in. For instance, Rainbow Dash with her adventurous spirit could be like a young pirate eager to prove herself. She could learn sword - fighting from the pirates and add her own flying skills to their adventures.
Harry Potter himself could be seen as a kind of foreign wizard in the RWBY world. He might be initially confused by the concept of Dust but quickly adapt and use his magic to enhance the RWBY team's capabilities. Hermione would probably be fascinated by the study of Dust and Semblances, and use her vast knowledge to help bridge the gap between the two magic systems. Ron could be the one who forms quick friendships with the RWBY characters, sharing his sense of humor and loyalty.
Blake could be a bit of an enigma in Middle - earth. She might have some similarities to the Rangers, as she is used to being on her own and is very stealthy. Her faunus heritage could also add an interesting dynamic, as she could have some unique abilities that are different from the normal races in Middle - earth. Yang, with her strength and courage, would be a great addition to any battle. She could be like a female version of Gimli, always ready for a fight and not afraid to take on powerful enemies.
If we think about it, Percy could use his ability to communicate with sea creatures to help the pirates. For instance, he could ask the dolphins to lead the ship to a safe place or warn them about incoming danger. The pirates would be amazed by this. Meanwhile, the demigods would be shocked by the pirates' lack of knowledge about the Greek gods but also impressed by their sailing skills and their ability to survive in a cut - throat world. The interactions would be full of misunderstandings at first but could grow into mutual respect as they face challenges together.
In a 'noctis in rwby fanfiction', Noctis' ability to use magic, like his elemental attacks, would be a significant factor. In the RWBY world, magic is a somewhat mysterious and not - fully - explored aspect. Noctis could introduce new forms of elemental combat. His fire - based attacks could be used to counter ice - type Grimm, and his lightning attacks could stun enemies, allowing his RWBY allies to deliver finishing blows. Also, his ability to enhance his physical abilities with magic, such as increased strength or speed, would make him a formidable ally in battles against the powerful Grimm and any human adversaries that might arise.
Grimlock's abilities are very physical and brute - force based. In the RWBY universe where there are a variety of Semblances and Dust - based powers, his raw power would stand out. His durability would allow him to withstand attacks from powerful Grimm. And his combat skills, which are more instinctual, could be an interesting contrast to the more refined fighting styles of the RWBY characters. He could also potentially use some RWBY - specific elements like Dust to enhance his already powerful attacks.
A half - Grimm OC could fit in as an outcast. Since Grimm are the enemies in the RWBY universe, a half - Grimm would be seen with suspicion. But they could also be a key to understanding the Grimm better. For instance, they might be able to detect hidden Grimm lairs or weaknesses that others can't. They could team up with the main characters like Ruby and the others, gradually earning their trust through their unique skills.
One idea could be that the RWBY characters find themselves on a cursed ship similar to the ones in Pirates of the Caribbean. Ruby could be the fearless leader, using her scythe in sword - fights on the ship's deck. Weiss might be the one trying to figure out the magic or curses involved, with her knowledge of Glyphs. Blake could use her stealth skills to explore the ship and discover hidden secrets, and Yang would be the muscle, ready to take on any enemy pirates.
Kaneki Ken could fit in as an outsider with a dark past, much like some RWBY characters. His struggle with his dual nature as a human - ghoul could parallel the internal conflicts of RWBY characters dealing with their own powers and identities. For example, Ruby's journey to understand her silver - eyed warrior powers.
He could be integrated as a powerful enemy at first. He might target the academies because he sees them as places that are trying to control and limit power, which goes against his own philosophy. However, as the story progresses, he could have a change of heart after seeing the selfless acts of the RWBY characters. He could then use his powers to help them against a common enemy like Salem.