Ragna from Blazblue and Ruby from RWBY could be an interesting pairing. Ragna is a brooding anti - hero with a powerful combat ability, while Ruby is an optimistic and energetic young huntress. Their different personalities could lead to some great character interactions, like Ragna being a bit cynical at first but slowly being influenced by Ruby's positive attitude. Another interesting pairing could be a Persona user, say Yu from Persona 4, and Jin from Blazblue. Jin is a cold and reserved swordsman, and Yu could use his empathetic nature and Persona powers to try to break through Jin's icy exterior. And for a third pairing, Blake from RWBY and a Persona user like Akechi from Persona 5. Blake has her own secrets and a complex past, and Akechi's dual nature could create an interesting dynamic as they both have things they are hiding.
One interesting pairing could be Noel from Blazblue and Weiss from RWBY. Noel is a kind - hearted and somewhat naive girl, while Weiss is a bit more haughty and prideful. Their interactions could be full of Weiss trying to teach Noel about propriety and Noel in turn showing Weiss the value of a more down - to - earth attitude. Then there's the pairing of Makoto from Persona 5 and Yang from RWBY. Makoto is a strict and responsible student council president type, and Yang is a more free - spirited fighter. They could learn a lot from each other, with Makoto perhaps learning to loosen up a bit and Yang learning some discipline. Also, Tager from Blazblue and Ren from RWBY could be a cool pairing. Tager is a large and imposing figure, and Ren is a more stealthy and mysterious character. They could have an interesting relationship as they both have their own unique ways of approaching combat and challenges.
Naruto and Ruby would be an interesting pairing. Naruto's positive and energetic nature would contrast well with Ruby's somewhat more reserved but determined self. They could bond over their shared goal of protecting their friends and worlds. Another great pairing could be Sasuke and Weiss. Sasuke's cool and brooding demeanor against Weiss' ice - cold exterior would make for some intense interactions. They could also learn from each other's combat styles. And then there's Kakashi and Blake. Kakashi's wisdom and experience as a ninja could help Blake with her own inner demons and her fight against the White Fang, while Blake could introduce Kakashi to the concept of the Faunus in the RWBY world.
Blake and Brian could be an amazing duo. Blake, with her love for books and her complex past, and Brian, the intelligent dog who is also a bit of a philosopher. They could have deep conversations about ethics and morality, all while being in a world that is a mash - up of RWBY and Family Guy.
Yang and the special forces' hand - to - hand combat expert. Yang is already a powerful fighter in close - quarters combat. The combat expert could teach her new moves and ways to better control her strength, while Yang could show the expert how to use her Semblance to her advantage in combat.
Ruby and Julian. Ruby is full of energy and has her powerful scythe skills, while Julian is a brilliant scientist in Genlock. They could have an interesting dynamic where Ruby is constantly amazed by Julian's inventions and Julian is in awe of Ruby's combat abilities and her positive attitude in the face of danger.
A possible plot could be that there is a strange energy disturbance that starts to merge the three universes together. Characters like Ragna from Blazblue, the Persona users, and Team RWBY find themselves in a strange new world that is a mix of all three. They must figure out what is causing this and how to stop it. Maybe there are also new enemies that are created from the combination of the different mythologies and technologies of the three universes. For instance, Grimm with the ability to use Persona - like powers or Blazblue - style Ars Magus. It would be a great opportunity for character development as they learn to work together despite their differences.
Ruby and Noel would be a great pairing. Ruby is young, energetic, and has a strong sense of justice. Noel is also a very determined and kind - hearted character. They could bond over their shared values and also learn from each other's combat styles. Ruby could show Noel some of her acrobatic moves with Crescent Rose, while Noel could teach Ruby some of the finer points of her swordsmanship.
A cool pairing would be Corrin from Fire Emblem Fates and Makoto Niijima from Persona 5. Corrin has a complex backstory and the ability to transform, while Makoto is intelligent and has a strong sense of justice. They could work together to solve problems in both their worlds. Also, the contrast between Corrin's more fantastical abilities and Makoto's more down - to - earth detective skills would be fascinating. Additionally, Ike from Fire Emblem and Akira Kurusu from Persona 5 would be great. Ike is a powerful warrior, and Akira is a strategic thinker. They could learn a lot from each other in combat and in dealing with their respective foes.
Weiss and Carolina could be a great match. Weiss is a refined and skilled fighter with a strong sense of duty, while Carolina is a tough and no - nonsense military type. Their different backgrounds and approaches to combat could lead to some intense training sessions and a mutual respect as they realize each other's strengths.
Weiss and Val/entina could be a great pairing. Weiss, with her refined and aristocratic upbringing, might initially clash with Val/entina's more street - smart and sassy attitude. But as they get to know each other in the fanfiction, they could find common ground in their determination and strong - willed natures. They could also share combat techniques, with Weiss teaching Val/entina about Dust - based attacks and Val/entina showing Weiss some of Genlock's hand - to - hand combat moves.
Ruby and Yu Narukami. Ruby is young and full of energy, always eager to fight for what's right. Yu is a calm and collected leader. Their different personalities would make for an interesting dynamic. Ruby could learn from Yu's more methodical approach to problem - solving, while Yu could be inspired by Ruby's unwavering determination.