Naruto himself would be very interesting. His never - give - up attitude and his ability to make friends easily could lead to some really fun interactions in the Red vs Blue universe. He could be the one to break down barriers between the two groups. Also, his powerful jutsu like the Rasengan and Shadow Clone Jutsu would be a game - changer in the battles of the Red vs Blue world.
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 Sarge would make for an odd but fascinating pair. Weiss is refined, proper, and used to a certain level of order. Sarge is loud, military - minded, and often a bit over - the - top. The clash of their personalities would be comical at first, but they could learn from each other. Weiss could teach Sarge some finesse, and Sarge could show Weiss how to be more assertive in a different kind of way.
Yang and Tucker could also work well together. Yang is strong and confident, while Tucker has his own brand of bravado. They could get into all sorts of adventures and battles, with Yang using her brawler style and Tucker with his sword and unique abilities. Maybe they'd compete for who can take down the most enemies in a fight.
Mercy and Doc would also be a great pairing. They are both medical personnel in their respective universes. They could exchange medical knowledge, with Mercy teaching Doc about some of the more advanced medical technology in the Overwatch universe, and Doc showing Mercy some of his improvised medical techniques that he's developed in the Red vs Blue world.
I think Tucker from Red vs Blue and Yang from RWBY would be an interesting pairing. Tucker is known for his laid - back but confident attitude, and Yang is a strong and fearless fighter. They could bond over their combat skills and exchange stories about their respective worlds.
Ruby and Church would be really interesting. Ruby is all about being positive and leading her team, while Church is sarcastic and often a bit grumpy. Their different personalities could lead to some really funny exchanges. For example, Ruby might be excited to show Church her scythe, and Church would probably make some snarky comment about how impractical it looks but then be amazed when he sees her use it.
On the Red side, Kakashi would be a great addition. His experience, intelligence, and the Sharingan in his left eye would make him a valuable asset. For the Blue side, Rock Lee would be fascinating. His hard - work - pays - off philosophy and his unique taijutsu skills, especially the Drunken Fist style, would bring a different kind of energy. Also, Hinata could be on the Red side. Her gentle nature combined with her Byakugan and new - found confidence would be interesting to explore in the context of the crossover.
Kirby would be really interesting. His innocent appearance combined with his extremely powerful abilities makes for a great contrast. He could be the source of both humor and unexpected plot twists. For example, when he first meets Naruto, Naruto might try to offer him ramen, not knowing Kirby's preference for food is more about swallowing enemies. And Kirby's reactions to the different jutsu in the Naruto world could be really fun to write about.
Ainz Ooal Gown would be very interesting. His complex personality, with his mix of pride as an Overlord and his insecurities hidden beneath, would create a lot of depth. In the Naruto world, his reactions to the different values and cultures would be fascinating. For example, how would he deal with the concept of chakra compared to his own magic? And how would he interact with the ninjas who have such different combat styles and moral codes from his undead minions?
One of the popular pairings might be Naruto and Church. Their different leadership styles could make for an interesting dynamic in a story. Another could be Sasuke and Tucker, as their skills and personalities are quite different and could create some good conflict and growth in a relationship.