One common theme is the idea of family. Since Naruto and Erza are in a brother - sister relationship in these fanfics, the concept of building a new family, loyalty, and protecting each other is often explored.
Another theme is the combination of different powers. Naruto has his ninja techniques and Erza has her magic. Fanfics usually play around with how these two different power systems interact and complement each other in battles or in solving problems.
Friendship and teamwork are also common themes. The idea of Naruto, who is all about his friends in his own story, and Erza, who is a key part of her guild, coming together to form a new kind of friendship and work as a team is really appealing in these fanfics. For example, they might face a powerful enemy that requires both of their unique skills to defeat.
A common theme is friendship. Since Naruto and Erza come from different universes, their journey of becoming friends is often explored. For example, they might start off not trusting each other but then learn to rely on one another.
Another theme is adventure. Since they are from different realms, they usually embark on a journey together. This could involve exploring new places, facing unknown enemies, and uncovering secrets. In many fanfics, they use their unique skills to overcome obstacles during these adventures.
One common theme is protection. The brother might be very protective of Erza Scarlet, given the dangerous situations they often face in the Fairy Tail universe. Another theme could be loyalty. They would be loyal to each other no matter what challenges come their way.
They could have adventures where they combine their skills. Naruto could use his ninja techniques like shadow clones, and Erza could use her different armors and magic. For example, they might fight against a powerful enemy that is a threat to both their worlds. Naruto's clones could distract the enemy while Erza changes into her strongest armor to deliver a powerful blow.
One common theme is loyalty. Brothers in these fanfics often show extreme loyalty to each other, like in the original Naruto series. For example, they might fight side by side against powerful enemies to protect each other.
Friendship is another common theme. Even though they are brothers, their relationship also has elements of friendship. They make friends together, or their friends play a role in their relationship. For instance, Naruto's friends like Sasuke and Sakura might interact with his brother in different ways. And sometimes, the theme of revenge can also be there if something bad happened to their family in the past. But overall, these themes make the 'naruto a brother fanfic' stories rich and engaging.
One common theme is the struggle for identity. Since he's in Erza's shadow, he often has to find his own place. Another theme is family loyalty, as he tries to support Erza and live up to the Scarlet name.
One common theme could be loyalty. Since they are brothers, loyalty within their relationship might be explored. For example, how they support each other in difficult situations.
Responsibility is a common theme. As an older brother, Naruto has to take care of others. Another theme is protection. He needs to protect his siblings from various threats in the Naruto world.