Well, it depends on personal taste. Some people might like it because it offers a unique twist to the Naruto universe by making him the son of Atlas. It can bring in new storylines and character developments that are different from the original Naruto plot.
A frequent theme could be destiny. Since Naruto's heritage is changed, his pre - determined path in the Naruto world would be altered. This could lead to a theme of him trying to find his new place in the world. Also, there could be a theme of conflict, especially if his new identity as the son of Atlas causes friction with the existing power structures in the Naruto universe.
Obviously Naruto is one of the main characters. Since it's about him being the son of Atlas, he'll be at the center of the story. Another main character could be a mentor figure who helps Naruto understand and control his powers related to Atlas.
One possible interesting plotline could be Naruto having to deal with the powers he inherits from Atlas in a world that already fears his Jinchuriki powers. He might struggle to balance the new abilities and the expectations that come with being related to a powerful figure like Atlas.
The theme of family also plays a role. Percy has a complex relationship with Atlas as his father. Some fanfictions explore how this new family connection impacts his view of family, especially compared to his relationship with his mother and his friends who were like family. There could be moments where Percy has to choose between his loyalty to his new - found father and his old relationships, creating a lot of internal conflict and drama within the story.
It expands the universe by introducing new locations from the atlas. These new places can have unique cultures, like a village where everyone can use a special type of wind - based jutsu only found in that area.
In this fanfiction, perhaps Harry discovers his true heritage as the son of Atlas gradually. He might face challenges not only from the wizarding world but also from the realm of the Titans. His friends at Hogwarts could be both amazed and a bit scared of his newfound abilities, which are far beyond normal magic. For example, he could have the strength to lift extremely heavy objects with ease, and this might come in handy during battles or when solving mysteries around the school.
The main character is Harry Potter. His friends Hermione and Ron are likely to be main characters as well. There may be some antagonists from the Titan realm who oppose Harry because of his potential power. There could also be some other Hogwarts students who get involved in Harry's journey to discover his true identity as the son of Atlas. And perhaps an old wizard who has knowledge about the connection between the wizarding world and the Titans and helps Harry along the way.
One common theme is the exploration of different power systems. Since both Naruto and RWBY have unique ways of using power, fanfictions often explore how these powers interact. For example, how would Ruby's scythe skills compare to Naruto's taijutsu?
Perhaps a story in naruto atlas fanfiction focuses on how the atlas was created. It could involve ancient shinobi clans and their secrets. Maybe the Uchiha clan had a hand in its creation, and Sasuke discovers this through some old scrolls, leading to a whole new adventure that also ties in with Naruto's journey to bring peace to the ninja world.