Could be that the crossover doesn't mesh well or there's a continuity error. Maybe the power levels of the characters aren't balanced properly.
Maybe the mistake could be in the character development. Sometimes authors don't flesh out the characters as well as they could in fanfics.
The mistake might be in the portrayal of the powers or skills of the characters. Sometimes, they might be too weak or too strong compared to the canon.
One possible plot could be that Naruto somehow gets transported to the RWBY universe. He teams up with Neo. Maybe they start off as rivals, with Neo being distrustful of Naruto at first because of his strange powers. But as they face common enemies, like the Grimm in the RWBY world, they learn to work together and combine their unique abilities, like Naruto's jutsu and Neo's semblance.
One common theme could be the clash of different cultures. Naruto comes from a ninja - based culture, while RWBY has its own unique world with different rules. When it comes to Kali, her character might bring in elements of family and loyalty from RWBY. So, the cultural differences and how the characters overcome them can be a theme.
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.
It could be a combination of villains from both universes. For example, Orochimaru from Naruto could team up with Salem from RWBY. Orochimaru is interested in the power of the Grimm and Salem wants to learn about the power of chakra. Their combined evil could be a huge threat to Naruto and Neo, forcing them to use all their skills to defeat this powerful alliance.
Well, it's likely unique because it combines two very different universes, Naruto and RWBY. The 'daddy's little devil' aspect might add a certain family - dynamic or a more personal relationship angle to the story that sets it apart from other crossovers.
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.
Well, it's interesting because it allows for new character interactions. Imagine a Spartan from Halo teaming up with Ruby from RWBY. Their different skills and personalities would make for an engaging story. Also, the contrast between the two universes' aesthetics, like the gritty, mechanical look of Halo and the more colorful, anime - inspired RWBY, adds to the appeal. Fans of both can see how their favorite elements mesh together, whether it's the Covenant vs the Grimm or the Spartans using their advanced weaponry in the RWBY world.
The theme of friendship and loyalty is often seen in these fanfics. Weiss is part of the RWBY team, and fanfics will show how she and her teammates support each other through tough times. Additionally, some fanfics explore Weiss's magical abilities and her journey to become a more powerful huntress, which is also a recurring theme.