Rider from Fate Zero and Ozymandias from Fate Grand Order could be a fascinating pair. Both are powerful and prideful kings. They could engage in a battle of wits and power, or they could find common ground in their kingly natures. Maybe they would discuss their different kingdoms and the ways they ruled, and their conversations could be filled with grandiosity and philosophical debates about leadership and power.
Naruto and Saber would be an interesting pairing. Saber's noble and chivalrous nature combined with Naruto's energetic and optimistic personality could create a unique dynamic. They could learn from each other's fighting styles and moral codes.
One of the popular pairings might be Saber from Fate Grand Order and Ruby from RWBY. Saber is a well - known and powerful character, and Ruby is the main protagonist of RWBY. Their combination can create some interesting dynamics, with Ruby's enthusiasm and Saber's more serious and noble nature. Another could be Archer from Fate Grand Order and Weiss. Archer's snarky and confident attitude might contrast well with Weiss's more refined and sometimes uptight personality.
One idea could be to have the Servants from Fate Grand Order interact with the events and characters of Fate Zero in unexpected ways. For example, Mash could end up in the middle of the Fourth Holy Grail War and try to prevent some of the tragedies from happening. She might team up with a young Kiritsugu, using her knowledge from the future to guide him. Another could be that a Grand Order Servant like Artoria Alter gets involved in the war and changes the power dynamics completely, as her dark and powerful nature would be a wild card in the already complex Fate Zero setting.
Lucy from Fairy Tail and Rin from Fate could form an interesting duo. Lucy is a Celestial Spirit mage, and Rin is a skilled mage in her own right. They could bond over their shared love for magic and their determination to protect their friends. They might also exchange knowledge about different types of magic, with Lucy showing Rin her Celestial Spirit magic and Rin introducing Lucy to some of the more unique spells in the Fate universe.
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.
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.
In 'naruto x fate grand order fanfiction', Naruto is a top pick. His iconic jutsu like Rasengan and his ability to befriend and influence others can lead to exciting stories. Then there's Itachi. His self - sacrificing nature and his powerful Sharingan abilities can be reimagined in the Fate context in really cool ways. Also, some of the Fate Grand Order Servants that are paired with Naruto characters often gain popularity, such as Saber. Their interactions with Naruto characters can create unique and engaging fan - made storylines.
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.
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.