Naruto and Bella could be an interesting pair. Naruto's energetic and positive nature could contrast with Bella's more introverted and moody self. It could create a unique dynamic where Naruto tries to cheer up Bella and she, in turn, shows him the more complex emotional side of the Twilight world.
Sasuke and Edward might be paired in some fanfictions. They both have that brooding, mysterious air about them. They could start off as rivals, each thinking their own power is superior, whether it's Sasuke's Sharingan or Edward's vampire abilities. But then they might find common ground and end up working together against a greater threat.
Another possible pairing could be Hinata and Alice. Hinata is shy and gentle, while Alice is perky and has the ability to see the future. Hinata could learn a lot from Alice about being more assertive, and Alice could be intrigued by Hinata's ninja skills and her unwavering loyalty to those she loves.
Well, I think Green Lantern and Rock Lee would be an interesting pair. Green Lantern's power of creating constructs with his ring could be used in creative ways along with Rock Lee's taijutsu. Also, Wonder Woman and Hinata could be paired. Wonder Woman's combat skills and Hinata's Byakugan - enhanced fighting style would make for a great combination. And Flash and Kiba with his dog Akamaru could be a fun pair, with Flash's speed and Kiba's speed - based ninja techniques.
Another possible pairing could be Sasuke and Elsa. Sasuke has his own dark past and a brooding personality. Elsa also has her own internal struggles with her powers. They could bond over their shared experiences of having to control something within themselves that others might fear. And their cool and somewhat aloof demeanors could make for an interesting dynamic.
Naruto and Bart could be a likely pair. Both are mischievous in their own ways. Naruto is always getting into trouble with his pranks in the ninja academy, and Bart is constantly causing chaos in Springfield. They could get up to all sorts of antics together, like pulling pranks on the other characters in both universes.
Sasuke and Sein could be an unexpected but fascinating pair. Sasuke's brooding and powerful presence might contrast with Sein's pure and guiding spirit. Their interactions could lead to some great character development for both of them.
I think Hinata and Rias could be paired up in some way. Hinata's gentle nature and her strong loyalty could complement Rias' leadership and determination. They might form an unexpected friendship or even a strategic alliance within the fanfiction's plot.
Sasuke and Tex might be likely to be paired up. Both are strong and somewhat brooding characters. Sasuke's quest for power could be paralleled with Tex's own abilities and her role in the Red vs Blue universe. They might engage in some intense battles or even end up having to work together against a common enemy, leading to some interesting character development for both of them.
Harry Potter and Nate Ford could be a likely pair. Harry's experience with facing great evils and his leadership skills combined with Nate's strategic mind in planning heists would make for an interesting dynamic. They could learn from each other's methods of problem - solving.
Harry Potter and Captain America are likely to be paired. Harry is used to leading a group against dark forces, and Captain America is a natural leader too. Their leadership styles could complement each other. Also, they both have a strong sense of justice.
I think Aqua would be an interesting character to be paired with in Pokemon fanfiction. Given her strong will and combat skills, she could be a great trainer. She might be particularly interested in Water - type Pokemon and train them to be extremely powerful. Roxas could also be a likely character. His connection to Sora and his own unique fighting style could make for an exciting story. He could be on a journey to discover more about himself while also exploring the Pokemon world. And of course, King Mickey. His leadership and magical abilities would make him a formidable ally in the Pokemon world. He could lead a group of trainers and Pokemon against a great threat, like a new type of Heartless - like Pokemon.
Ruby and Goku could be a likely pair. Ruby is young and full of potential, much like Goku was when he started his journey. Goku could be a mentor - like figure to Ruby, teaching her about Ki and new combat techniques. Another pair could be Weiss and Vegeta. Weiss is from a noble family and has a sense of pride, similar to Vegeta. They could have an interesting dynamic where they initially clash due to their strong personalities but then grow to respect each other. Yang and Trunks could also be paired. Yang is a strong and fearless fighter, and Trunks has his own badassery. They could team up in battles and share their experiences of growing up in tough situations.