One common theme could be the clash of different universes. Naruto's ninja world and the world of Red vs Blue are very different, so exploring how the characters adapt to the new environment is often seen. Another theme might be friendship. Characters from both series might form unexpected friendships or alliances.
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.
In this type of fanfiction, a great concept is the team - up aspect. Picture Naruto and his friends teaming up with characters from Red vs Blue to face a common enemy. This could lead to some really unique battle strategies. Additionally, the concept of the Sharingan or other special abilities in Naruto being introduced to the Red vs Blue universe and how they would be perceived and used there. For instance, the Sharingan's ability to copy techniques could give a huge advantage to a Red vs Blue character in combat.
One common theme could be the clash of different worlds. Naruto's ninja world and the military - based world of Red vs Blue are very different, so exploring how they interact is often a theme. Another might be the characters adapting to new environments. For example, Naruto characters in the Red vs Blue setting having to deal with different technology and combat styles.
Naruto would likely be very energetic and friendly, which might initially be a bit much for Carolina. But his determination and strong sense of justice would earn her respect. Carolina, being a tough and no - nonsense character, would probably be a bit skeptical of Naruto's ninja powers at first. However, as they face challenges together, they would start to rely on each other more and develop a friendship based on mutual trust.
One possible plot could be that Naruto finds himself in the world of Red vs Blue. He teams up with Carolina, and they face off against common enemies. Maybe they have to deal with a new, powerful foe that combines the skills of both their universes, like a chakra - using mercenary. Their different fighting styles and personalities would lead to some interesting interactions and growth throughout the story.
Well, obviously Naruto would be one of the main characters. Since it's a red vs blue concept, there could be two versions of Naruto representing the red and blue sides respectively.
I'm not really into that specific crossover myself, but generally when looking for fanfiction like 'red vs blue naruto x carolina', it's important to look for well - written ones. Check the reviews and ratings on the fanfiction platforms. Maybe start with the ones that have high ratings and positive reviews. They are more likely to be engaging and well - crafted in terms of plot and character development.
One possible plot could be a crossover where Naruto characters end up in the Red vs Blue universe. They might initially be confused by the different combat styles and technology. For example, Naruto's clones could be a huge advantage in the Red vs Blue battles. The Red and Blue teams could be either in awe or trying to figure out how to combat this new threat or ally. The story could then revolve around them working together to defeat a common enemy that threatens both universes.
You can try searching on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of fanfictions for various fandoms, including Red vs Blue. Just use the search bar and type in 'Red vs Blue Church x Carolina' and it should show relevant stories.