The fact that Percy is both a magician and a demigod is really exciting for creating storylines. Firstly, his two identities can lead to internal conflicts. He has to balance the rules and ethics of the magic world with those of the demigod world. For instance, in the magic world, there could be a ban on using certain powers for personal gain, while in the demigod world, it might be more acceptable in some situations. Secondly, his dual identities can open up new settings. He could visit magical places that are unknown to most demigods and bring back knowledge or items that change the power dynamics in the demigod world.
As a demigod, he might have superhuman strength, speed, and the ability to control water. As a magician, he could have the power to cast spells. For example, he could combine his water - controlling ability with a spell to create ice sculptures with magical properties. He might also be able to teleport short distances using magic, which is different from any demigod power he has.
You need a lot of inspiration. Observe your surroundings, read other works, and think about what hasn't been done before.
By having the gamer introduce modern concepts to the Naruto world. For example, the gamer could introduce the concept of a tournament with brackets and elimination rounds, which is a common gaming tournament structure. This would be a new way of determining the strongest ninja in the village.
The swords themselves can have unique qualities. They could be magical, like in the fanfiction 'The Enchanted Dual Swords of Percy'. One sword might have the power to freeze enemies in place, while the other can set things on fire. This not only makes Percy's battles more interesting but also forces him to strategize about which sword to use in different situations. It also gives the author a chance to be creative with the powers and how Percy discovers and masters them.
He probably tries to keep it a secret as much as possible. Percy knows that if his identity is revealed, it could put himself and his friends in danger. So he might use his powers subtly, like when he needs to be quick in gym class or when he senses a monster nearby but has to act normal.
Percy's knowledge of Greek mythology, which is part of his demigod upbringing, can be very useful. In medical school, there might be cases related to ancient diseases or conditions that have roots in mythology. His understanding of those could lead to unique insights and solutions. Also, his experiences fighting monsters in the demigod world might have given him a high - stress tolerance, which is beneficial during tough exams and high - pressure clinical situations.
One common storyline is Percy adjusting to the Roman demigod life. He has to learn new rules and ways of the Roman camp.
Madara's pride and Tsunade's determination can also be a great source of storylines. Suppose there is a competition in the shinobi world for a powerful artifact. Madara believes it should be his because of his strength and status, while Tsunade is determined to get it to keep it out of the wrong hands. Their personalities would drive their actions in this race, with Madara using his strategic mind and brute force, and Tsunade using her intelligence and the support of her allies.
The unique storylines also come from the fact that the two universes have different power systems. In Harry Potter, it's about magic power and knowledge. In Riddick, it's about physical strength, combat skills, and the ability to survive in harsh conditions. Fanfiction can explore how these power systems interact. Maybe a character from Riddick's world is given a magical item and has to figure out how to use it without any prior knowledge of magic, or a Harry Potter character has to rely on Riddick - style survival skills when their magic fails them.
Percy's water - controlling ability could give him an edge in fluid - related scientific research. For example, he could manipulate water at a microscopic level to observe its behavior more closely. His ability to communicate with sea creatures might provide him with unique data about the ocean's ecosystem that would be difficult for regular scientists to obtain.