In RWBY x Naruto fanfiction, a cool concept is the crossover of character relationships. For instance, Ruby could befriend Naruto due to their similar positive outlooks and determination. Weiss might have an interesting dynamic with Sasuke as they both come from noble families and have a certain pride. Also, the idea of RWBY's world being opened up to the idea of ninja training academies and Naruto's world getting to know about Dust - based technology would make for some really engaging stories.
Yes, there are some. You can check fanfiction websites like Archive of Our Own. Just search for 'rwby naruto x cinder' in the search bar and you'll find a variety of stories written by different authors. However, the quality may vary, so you might need to read a few to find the ones that suit your taste.
In 'rwby naruto x cinder fanfiction', a frequent theme is the exploration of different power systems. Naruto's chakra - based powers and RWBY's semblance - based powers are very different. Cinder, with her own abilities, fits into this mix. Writers often use this as a theme to create interesting battles or training scenarios. Another theme is the adaptation to new environments. Naruto being in the RWBY world or vice versa, and how they all interact with Cinder in this new environment is also quite common. And of course, the theme of love or romantic relationships between the characters might also pop up in some of these fanfictions, though not always in a traditional way.
I think Qrow could be really powerful in a RWBY x Naruto fanfusion. He has his own set of skills and if he were to learn some of the more powerful jutsu from Naruto, like the Rasengan or some of the more advanced sealing techniques. His experience as a Huntsman and his natural combat abilities would be enhanced greatly. And Weiss with her Glyphs and if she were to learn some chakra - based techniques could also be a very powerful combination.
Well, a 'naruto x rwby fanfic' could center around a training arc. Imagine Naruto training the RWBY team. He could help Ruby improve her speed and combat skills by teaching her some of his ninja movement techniques. Yang could learn from Naruto how to better control her temper during battles, similar to how Naruto had to control his Nine - Tails' chakra. Meanwhile, the Naruto characters could also be learning about the Grimm and how to fight them. They could incorporate their ninja tools and jutsu to combat these new and strange enemies from the RWBY world.
The most interesting aspect is the combination of powers. Naruto's jutsu and the RWBY characters' semblances create really cool and unique combat scenarios. For example, seeing Naruto use his Rasengan while Ruby uses her Crescent Rose in a joint fight is exciting.
There might be a fanfiction where Naruto is transported to the RWBY world and meets Sun. They start training together, and Naruto teaches Sun some of his ninja skills like chakra control. This could lead to interesting adventures as they use their combined skills to help Team RWBY in various missions.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, so there's a good chance you'll find 'naruto x rwby sun fanfiction' there.
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.