It might be used as a sort of plot trigger. Say there's a prophecy in the fanfiction that mentions the Valentine's Pity Rose. This would make it a central element that the characters have to seek out or protect. The rose could also be part of a quest, like the characters need to find it to break a curse that's related to love and pity in the Percy Jackson world.
The Valentine's Pity Rose could be incorporated into the fanfiction through the description of a Valentine's Day celebration at Camp Half - Blood. A camper who has a crush on another but knows it's unrequited gives the rose as a symbol of their pity. This action then sets off a chain of events, like creating new friendships or rivalries. The rose can also be a way to show the different cultural interpretations of Valentine's Day within the context of the Percy Jackson universe, where Greek mythology and modern concepts collide.
Well, the 'Valentine's Pity Rose' could be a unique creation within the Percy Jackson fanfiction world. Maybe it has some sort of magical property related to love and pity. It could be used by a character to heal a broken heart in a different way than normal magic in the Percy Jackson universe. It really depends on how the author of the fanfiction has chosen to use it.
In some Percy Jackson fanfictions, Excalibur might be incorporated as a powerful weapon that finds its way into the hands of a demigod. It could be a plot device to add more power and mystery to the story.
One way could be by making him a mysterious new demigod. He could have his Sharingan ability which might be related to some special power in the Percy Jackson universe, like being able to see through the Mist more clearly than others.
Well, one way could be that in the fanfiction, Naruto's powers are somehow related to the Shinto gods. Maybe Naruto is on a quest in the Percy Jackson universe and he encounters a Shinto god who bestows him with a new power or task. For example, a Shinto god could give Naruto the ability to control water in a more magical way, similar to how demigods in Percy Jackson have special powers related to the gods.
Another possibility is that the Sharingan is a magical artifact that has been lost in the Percy Jackson world. A group of demigods could stumble upon it during one of their quests. They might not understand what it is at first, but as they start to explore its powers, they realize its potential. However, they also face the danger of the Sharingan's negative effects, such as the overuse leading to blindness. This would add an interesting dynamic to the story as they try to balance using this powerful tool while avoiding its drawbacks.
The theme of social class in 'The Outsiders' can be used. In 'Percy Jackson' fanfiction, you could create different groups of demigods based on their parentage or abilities. There could be an 'outsider' group of demigods who are looked down upon, similar to how the Greasers were. Percy could then work to bridge the gap between these groups, just as he tries to unite different camps in the original series.
One way is to use the Percy Jackson characters' powers in an Abrahamic setting. For example, Percy's ability to control water could be seen as a gift from God in an Abrahamic fanfiction. Another way is to have the Percy Jackson characters interact with Abrahamic figures. Like Percy meeting an angel and having a conversation about the nature of the world.
The Stones could also be a source of conflict in the fanfiction. Different factions in the demigod world might want to get their hands on the Stones for their own purposes. Some might want to use them for good, like protecting the world from Titans or other threats, while others could be more interested in using the Stones' power for personal gain and domination.
In a crossover fanfiction, the demon could be a result of some dark magic experiment gone wrong that combines the elements of both universes. For example, a sorcerer in the Percy Jackson world tries to use a spell from the Book of the Damned (from Supernatural) and accidentally creates a super - powerful demon. Percy and his friends, along with the Supernatural hunters, would then have to figure out how to stop it. This would involve the demigods using their unique powers like controlling water or flying, while the hunters use their knowledge of exorcisms and demon lore.
In the fanfiction, the 'ocean eyes' could be linked to a lost underwater civilization. A character with 'ocean eyes' might start having visions of this civilization through their eyes. These visions could guide them and their friends on a quest to find this lost place. Along the way, they would face various challenges and enemies, all while trying to figure out the significance of the 'ocean eyes' and the lost civilization.