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.
The pairing of Gilgamesh from Fate and the Shield Hero would also be fascinating. Gilgamesh is an arrogant and powerful king. The contrast between his haughty nature and the Shield Hero's more down - to - earth and determined personality would create a lot of tension and interesting storylines. Maybe Gilgamesh would initially look down on the Shield Hero but then come to respect his strength and tenacity.
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.
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.
I think Natasha Romanoff and Melinda May would be an interesting pair. Both are strong, badass women with a lot of combat experience. They could share their stories of their past missions, and also train together. Maybe they could even have a friendly competition to see who is better at hand - to - hand combat or espionage.
Another interesting pairing could be Batman and Daisy Johnson. Daisy has her inhuman powers, especially her seismic abilities. Batman could be intrigued by her powers and try to find ways to use them effectively in combat. And Daisy could learn a lot from Batman's combat training and his no - nonsense attitude towards fighting crime. They could form a strong duo when it comes to facing enemies that require both brute force and strategic thinking.
One really interesting character pairing could be Fitz - Simmons and the TMNT as a whole. Fitz - Simmons are brilliant scientists, and the turtles are a scientific anomaly. They could study the turtles and their mutagenic origin. The turtles could also benefit from Fitz - Simmons' knowledge of advanced technology. Another pairing that would be cool is Agent Ward (assuming he's not evil in this fanfiction) and Leonardo. Ward is a skilled agent, and Leonardo is a skilled ninja. They could exchange fighting and survival skills, and their different perspectives on loyalty and duty could lead to some interesting story arcs.
I think Shirou Emiya from Fate and Rin Okumura from Blue Exorcist would be an interesting pairing. Shirou is a self - taught mage who is very determined, and Rin is a powerful exorcist. They could learn a lot from each other's fighting styles and magical abilities.
I think a pairing between Shiba Tatsuya from Mahouka and Archer from Fate would be really interesting. Tatsuya is a very powerful and intelligent magician in his own right, and Archer has a wealth of combat experience and a complex personality. They could have some great philosophical debates about the nature of magic and the purpose of their powers.
Hiro and Dash would make an interesting pairing. Hiro is a brilliant inventor and Dash has super - speed. They could combine their skills in a chase scene. Hiro could create some gadgets to enhance Dash's speed or help him navigate obstacles better, while Dash could use his speed to quickly get Hiro to where he needs to be for his inventions or investigations.