Sure. There are fanfictions that focus on character relationships. Maybe a character from Naruto forms an unexpected friendship with a character from Rave Master. They could learn from each other's cultures and ways of life. It's really interesting to see how the different personalities interact, like a serious Naruto character and a more carefree Rave Master character getting along and influencing each other.
Well, Reddit can also be a good place to look. There are subreddits dedicated to fanfiction where users might share or recommend Naruto x Rave Master fanfictions. You can post a request asking for good crossovers in relevant subreddits and the community might be able to point you in the right direction.
One common theme is the crossover of power systems. Since Naruto has ninja abilities and Rave Master has magic-based powers, seeing how these interact is often explored. For example, a Naruto character might try to use chakra in the Rave Master world in a unique way.
A common theme is adventure. Since they are part of the Rave Master story, many fanfictions have them going on quests and battles together. Another theme is friendship evolving into love. Their initial bond as comrades gradually turns into something more romantic as the story progresses in a lot of fan works.
Another common theme is power - up. Writers like to create scenarios where characters from both series gain new powers or enhance their existing ones. This could be through a combination of Fairy Tail's magic and Rave Master's unique abilities. For example, a character might learn a new spell by combining the power of a Rave Stone with their Fairy Tail magic. And also, the theme of adventure is quite common. As the two universes collide, there are new places to explore and new challenges to face, which makes for exciting adventure - based fanfictions.
There is also 'Naruto in the Rave Realm'. In this fanfiction, Naruto gets transported to the Rave Master universe and has to learn new skills and make new alliances to survive. It has an interesting plot that keeps you hooked.
It might actually be Elie from Rave Master. She has a very mysterious past and her powers are not fully understood. In a crossover, she could potentially unlock new levels of her power. Her ability to use the Rave stones in unique ways and her connection to the Rave could make her a very formidable opponent. Also, she has a strong will, which is an important factor in any battle.
One idea could be that Naruto and Haru from Rave Master are brought together by a mysterious force that is threatening both of their worlds. They have to combine their unique skills, like Naruto's shadow clones and Haru's Rave powers, to defeat the common enemy.
I'm not sure which specific fanfiction is the best, but you can also try searching on Tumblr. Sometimes, fans post snippets or links to their own Haru x Elie fanfiction there. It might be a bit more scattered compared to the other two platforms, but you could stumble upon some really creative and unique takes on their relationship.
Well, there are many out there. However, it really depends on what you're looking for in a 'fairy tail x rave master fanfiction'. If you like adventure - based ones, look for stories where the main characters from both universes team up to go on a quest. For example, Natsu from Fairy Tail and Haru from Rave Master could join forces to defeat a powerful new enemy that threatens both their worlds. These types of stories often have exciting battles and interesting character dynamics.