Perhaps it's a magical crystal that enhances his ability to communicate with magical creatures. This would be quite unique as it would give him an edge in dealing with things like thestrals or unicorns, and open up new storylines in the fanfiction. Harry could use this crystal to understand their needs and gain their help in various situations.
One possible scenario in this fanfiction could be that Naruto, being banished from his village, stumbles upon a magical realm. There, he might meet a mentor who teaches him magic. This could lead to him developing new powers and a whole new identity, different from the ninja he once was. It could also open up opportunities for crossovers with other magical universes in the fanfiction world.
There's Eris Boreas Greyrat. She is an important character as she has a complex relationship with Rudeus. She is strong - willed and her growth as a character is interesting to follow. Another one is Sylphiette. She is a friend of Rudeus and has her own story arc related to magic and her identity. Then there's Paul Greyrat, Rudeus's father, who also plays a significant role in the story, especially in terms of family dynamics.
In a Naruto learns God Slayer magic fanfiction, it could be really exciting. Naruto's already powerful ninja skills combined with God Slayer magic would make him an even more formidable force. He could use the magic in battles against tough enemies like Akatsuki members. Maybe he'd learn it from a mysterious character who travels between different dimensions, and this new power would give him an edge in protecting the Hidden Leaf Village.
Percy is the main character. There could be a powerful and mysterious mage who serves as a sort of antagonist at first. This mage tests Percy's skills and knowledge of magic. But as the story progresses, they might end up having a more complex relationship, like a reluctant alliance when they face a common, greater threat.
It might be a story where Harry delves into the family magic in order to solve some sort of mystery. For example, he could be looking for a way to defeat a new dark force and realizes that the family magic holds the key. He could learn new forms of magic related to protection or divination that are unique to his family.
Maybe an ancient god or goddess who has been forgotten by most but still holds great power in magic. This deity could see potential in Percy and choose to teach him magic as a way to bring back some balance in the world. It could be a goddess of magic who was once a part of the pantheon but has since been overshadowed.
Naruto could use his newfound magic to make alliances with other magical beings. This would expand his influence and power base. He could then use these alliances to either seek revenge on those who wronged him or to protect the world from greater threats that the ninja world alone couldn't handle. In this fanfiction, the possibilities are endless as magic adds a whole new dimension to his character.
One main theme is self - discovery. Harry realizing his ability for wandless magic is like finding a new part of himself. Another theme is breaking boundaries. Since wandless magic is not as common in the wizarding world shown in the original books, it represents going beyond the normal magical practices. And of course, there's the theme of growth, as Harry has to learn and develop this new skill, which often comes with challenges and setbacks.