Friendship and teamwork are often explored. Just like in the original Naruto and Fairy Tail series, fanfictions in this combination might show characters from different universes coming together, learning to trust and work with each other. They could face challenges that require them to combine their skills and abilities, which is a great way to develop new storylines. Also, themes of redemption and self - discovery can be present. A character who has made mistakes in their own universe might find a new path when interacting with characters from other series. This can add depth to the story and make it more engaging for readers.
Power - ups and training arcs are quite common too. Writers might create scenarios where characters from Naruto, Kagura's series (if applicable), and Fairy Tail train together or gain new powers through some extraordinary means. This could be due to a new threat that emerges, forcing them to level up. Another theme could be love and romance, whether it's between characters from the same series in this combined fanfiction world or cross - series romances, which can bring a whole new dynamic to the stories.
One common theme is the crossover of powers. For example, a character from Naruto might use their jutsu in a situation inspired by Fairy Tail's plot, or vice versa. And if Kagura is from a particular series with unique powers, those could be incorporated as well.