Well, it's hard to say exactly which are the most popular. But usually, the ones that focus on character interactions between RWBY and Fairy Tail characters tend to be well - liked. For instance, if Ruby meets Natsu and they team up for a battle. Also, fanfictions that add new twists to the existing storylines, like a new villain that threatens both RWBY and Fairy Tail universes, can attract a lot of readers.
In my opinion, fanfictions that explore the cultural differences between the two worlds are quite popular. The RWBY world has its own set of values and norms, and Fairy Tail has its magical guild culture. When these are blended in a fanfiction, it creates an interesting read. For example, how would the RWBY characters react to the Fairy Tail guild's rowdy and friendly atmosphere? And how would Fairy Tail mages deal with the Grimm in the RWBY world?
One of the most popular themes is romance. Fans often like to pair up different characters from Fairy Tail in romantic relationships. For example, Natsu and Lucy are a very common pairing. Another popular theme is adventure. Writers create new quests and challenges for the Fairy Tail guild members, expanding on the world that was created in the original series.
Some of the well - liked 'Fairy Tail Nalu kiss' fanfictions often involve the idea of Natsu protecting Lucy from a powerful enemy. In the heat of the moment, as he saves her life, he plants a passionate kiss on her lips. It's a classic trope that many fans enjoy. Also, there are fanfictions where they get magically transported to a different realm and in that strange new place, their relationship deepens and they share a kiss. There are also modern - day AUs (alternate universes) where they're normal high school students and their first kiss is a really sweet and innocent moment.
The combination of different power systems. In Fairy Tail, there's magic like fire, ice, and celestial magic. In RWBY, there are the unique Semblances and Dust - based powers. When combined in fanfiction, it creates a whole new range of possibilities for battles and character development.
I really like 'RWBY in Fairy Tail'. It has great character development as the RWBY girls try to adapt to the Fairy Tail world. Another one is 'Fairy Tail Meets RWBY', which has some exciting battle scenes where characters from both series team up.
One popular theme is redemption. Given Laxus' past actions in the Fairy Tail series, many fanfictions explore his journey to redeem himself. Another theme is power - his strong magic abilities and how he can develop or control them better.
The power - up theme is also common. For example, in some fanfictions, a character from MLP might gain new powers inspired by Fairy Tail magic. This allows for some really exciting action scenes and character development as they learn to control these new powers.
Power - up themes are quite common. Writers like to give characters new powers by combining the unique elements of both series. For instance, a character from Gintama might gain magical abilities from Fairy Tail. Also, the theme of redemption can be found. A character who has made mistakes in one series might find a chance to redeem themselves in the world of the other series. This gives a deeper meaning to the story and allows for character growth.
One popular theme is Ace's integration into the Fairy Tail world. Writers explore how he fits in, what kind of relationships he forms, and how his unique abilities play out in this new environment.
One popular theme is transformation. Just like I mentioned before, a character getting a haircut often symbolizes a change in their personality or their role in the story. For example, if a character was previously shy and reserved and they get a bold haircut, it could signify their new - found confidence.
The friendship - across - universes trope is also big. Characters from Naruto and Fairy Tail form strong bonds despite coming from different worlds. For example, Naruto and Natsu becoming best friends and fighting side by side against common enemies. Their different fighting styles and personalities complement each other, making for an exciting story.