Hinata and Goro could be another pairing. Hinata's gentle and kind nature would contrast with Goro's more practical and down - to - earth personality. However, they could complement each other well, with Hinata providing emotional support and Goro offering his more logical and strategic thinking in various situations that they might face together in the fanfiction.
A possible pairing could be Naruto and Zero Two. Naruto's positive and determined attitude could be a great match for Zero Two's strong - willed and somewhat wild nature. He might be able to understand her better than some of the other Darling in the Franxx characters and help her in her journey of self - discovery.
One possible pairing could be Naruto and M4A1. Naruto's positive and determined attitude could complement M4A1's more reserved and dutiful nature. Another might be Sasuke and UMP45. Sasuke's brooding and powerful presence could be an interesting contrast to UMP45's somewhat sassy but capable personality.
Naruto and the Red Ranger could be a great pairing. Naruto is full of energy and determination, and the Red Ranger is often the leader. They would both lead their respective teams in a combined battle. Another good one could be Sasuke and the Blue Ranger. Sasuke has his cool and calculating nature, similar to the more strategic Blue Ranger.
Hiro is also very interesting. He has a lot of character development throughout the light novel. He starts off as a somewhat ordinary pilot but as the story unfolds, he shows great courage and determination. His relationship with Zero Two is also a big part of what makes him such an engaging character as it changes and grows over time. There are also many layers to his personality, like his insecurities and his ability to rise above them.
Magnus Bane and Doctor Strange would make a great pairing. They are both powerful magic - users. Magnus could introduce Doctor Strange to the magic of the Shadow World, and Doctor Strange could share his knowledge of the mystic arts from the Marvel Universe. They could collaborate on spells and magical defenses against common enemies.
All Might and Captain America could be a great pairing too. They are both symbols of hope and justice in their respective universes. They could share their experiences of leading and inspiring others, and work together to boost the morale of the combined teams during a tough battle.
Kirby and Yang could also make an interesting pairing. Yang is strong and brash, while Kirby is small but mighty. Their personalities contrast but could also complement each other well. Yang could provide the brute force while Kirby could use his unique powers to support her in battles, like when she's facing a particularly tough Grimm.
A common interesting plot point is the power exchange. For example, when characters from Darling in Franxx gain some of Naruto's chakra - based powers. It makes for really exciting battle scenes as they use these new powers in their own mech - combat style.
One interesting crossover could be the sharing of combat skills. For example, the pilots in Darling in the Franxx might learn some of the ninja techniques from Naruto characters. They could incorporate things like shadow clones into their battle strategies, which would add a whole new dynamic to their fights against the Klaxosaurs.
Zero and Ruby would be a likely pairing. Zero is a powerful and skilled fighter, and Ruby has a lot of potential and a unique weapon. They could learn from each other's combat styles. Ruby could learn about Zero's more serious and battle - hardened approach, while Zero could be inspired by Ruby's enthusiasm and creativity in fighting.
I think Ruby and a young, adventurous Pilot would make a great pairing. Ruby's enthusiasm and eagerness to learn new things would mesh well with a Pilot's daredevil nature. They could exchange stories about their respective worlds while fighting side by side.