Weiss and Rin could be a great pair. Both are strong - willed and come from families with a certain reputation. Weiss's elegance in combat with her Glyphs and swordsmanship could be complemented by Rin's powerful magic. They might start off as rivals, constantly trying to one - up each other, but eventually realize they can achieve more by working together.
Another interesting pairing would be Yang and Saber. Yang is all about her strength and her fiery personality, while Saber is a noble and powerful Servant. Yang could be in awe of Saber's strength and leadership skills. Saber, on the other hand, might be interested in Yang's ability to keep going no matter what. They could have some great fight scenes together, with Yang's brawler style and Saber's swordsmanship.
Another great pairing could be Rin Tohsaka and the Shield Hero. Rin is a skilled mage in the Fate universe. She could help the Shield Hero understand the magic in the Fate world, and in return, the Shield Hero could show her some of his shield - based techniques that might be useful in combat. Plus, their different personalities would lead to some interesting interactions.
One of the most interesting pairings would be Saber and Elsa. They are both strong female characters with powerful magic. Saber could teach Elsa about combat and leadership, while Elsa could show Saber how to better control her magic in a more natural way. Also, Kristoff and Lancer could be an unexpected but interesting pairing. Lancer's pride and Kristoff's down - to - earth nature would create some fun interactions.
I think Harry Potter and Saber would make an interesting pairing. Harry has his own sense of justice and courage, and Saber is a noble and powerful Servant. They could learn from each other's leadership styles. Another good pairing could be Hermione and Rin. Both are intelligent and skilled in magic. They could exchange knowledge about their different magical worlds and maybe even come up with new spells or magical techniques together.
Ruby and Cayde - 6 would be an interesting pairing. Ruby is young and full of energy, always eager to learn and fight. Cayde - 6 is a witty and experienced Guardian. Their interactions could be really fun, with Cayde - 6 teaching Ruby some of his trick - shooting skills and Ruby showing Cayde - 6 the beauty of her Crescent Rose. Another great pairing would be Weiss and Ikora Rey. Weiss is a highly - trained fighter with a strong sense of discipline, and Ikora Rey is a powerful Warlock with great knowledge. They could share their knowledge of magic - like abilities, Weiss with her Glyphs and Ikora with her Light - based spells. Yang and Zavala could also be an interesting pair. Yang is all about brute strength and a go - getter attitude, while Zavala is a respected leader. Yang could learn about leadership from Zavala while Zavala could admire Yang's tenacity.
Ruby and a Skaven Assassin could be an interesting pairing. Ruby with her speed and scythe skills would be pitted against the sneaky and devious Skaven. It would be a battle of wits and speed. Another great pairing could be Weiss and a High Elf Mage. Weiss's elegance and ice powers could contrast and interact with the Elf's magic. And Yang and a Chaos Space Marine. Yang's brute strength and brawler style against the super - powered and corrupted Chaos Space Marine would make for an intense fight.
The Doom Slayer and Ruby would be an interesting pairing. Ruby is young and full of energy and hope, while the Doom Slayer is a silent, stoic force of destruction against evil. Their interactions could be really cool, like Ruby trying to understand the Doom Slayer's lack of words but seeing his determination and being inspired by it. And the Doom Slayer might see Ruby's potential and unwavering spirit in the face of danger as something similar to his own.
Ben and Ruby would be an interesting pairing. Ruby is young and full of energy, always eager to learn and improve. Ben, with his experience using the Omnitrix, could teach her a lot about adapting to different situations. And Ruby could show Ben the importance of teamwork in her own unique way.
Yang and Kenpachi would be a wild and exciting pairing. Yang is all about brute strength and has a bit of a hot - headed nature. Kenpachi is the same, always looking for a good fight. They could have some epic battles together, or team up and be an unstoppable force. Also, Blake and Urahara could be an interesting pair. Blake is stealthy and intelligent, and Urahara is a mastermind with all kinds of tricks up his sleeve. They could scheme together to solve the problems that come up in the crossover world.
Naruto and Ruby would be an interesting pairing. Naruto's energetic and positive nature would contrast and complement Ruby's own enthusiasm and leadership. They could bond over their shared goal of protecting their respective worlds and learn from each other's combat styles. Ruby could learn about Naruto's Rasengan while Naruto could be intrigued by Crescent Rose.