In a cultivation system fanfiction, you could explore the idea of a reverse - cultivation. Instead of getting stronger, the characters start losing their powers and have to find a way to regain them while also dealing with the challenges of a world that looks down on the weak. This would add a lot of drama and character development.
In Star Wars system fanfiction, a cool concept is to rewrite certain events with different outcomes. Like what if Anakin Skywalker didn't turn to the Dark Side? This could lead to a completely different Galactic Empire or even a more harmonious galaxy. Also, imagining new Jedi or Sith orders with their own sets of rules and philosophies can be really engaging.
One idea could be to create a new type of magic system within the Fairy Tail universe. For example, a magic that combines elements in unique ways, like water and fire to create steam - based offensive spells. Another could be to focus on a character who discovers a long - lost 'system' of magic that was thought to be extinct. This could lead to a whole new adventure as they explore its powers and how it fits into the existing world of Fairy Tail.
One idea could be to create a fanfiction where the Dragon Ball system is corrupted. For example, instead of granting wishes for good, the Dragon Balls start to cause chaos and the characters have to find a way to fix it. Maybe the balls are being controlled by an evil force from another dimension.
Some fanfictions in this category might explore different versions of Spider - Man's suit. Instead of the traditional red and blue, there could be a high - tech black and silver suit that has some unique functions like stealth mode or enhanced strength. This could lead to new adventures where Spider - Man has to learn to use these new abilities while still maintaining his moral code.
One idea could be a story about a lone wanderer who discovers a hidden vault that was never part of the original vault - Tec plan. They find it filled with advanced technology that could change the wasteland. Another could be a fanfiction where a group of settlers tries to build a new civilization based on pre - war values in the middle of the irradiated chaos. And also, a story about a mutant who has the ability to communicate with the mutated creatures and tries to broker peace between them and the humans.
A cool concept in naruto cultivation fanfiction is the idea of cultivating spiritual energy along with chakra. This could lead to a character having enhanced perception, being able to sense danger or the presence of others from a greater distance. Additionally, some fanfictions explore the idea of training in extreme environments, like a constantly changing and dangerous dimension, which forces the character to adapt and grow their powers in unique ways.
One idea could be a character in the RWBY world suddenly getting a gamer system that allows them to level up their combat skills like in a video game. For example, they could see their 'HP' (health points) and 'MP' (mana points) bars, and earn experience by fighting Grimm. Another plot could involve using the gamer system to unlock hidden abilities or weapons within the RWBY universe. Maybe a character discovers a special 'quest' within the system that leads them to a powerful relic.
A great plot for Percy Jackson system fanfiction is to have Percy and his friends discover a new, hidden part of Camp Half - Blood that has been sealed away for centuries. Inside, there are ancient powers and secrets that could either save or destroy the demigod world. As they explore, they face trials and challenges set by the long - dead founders of the camp. Also, you could write about Percy being cursed by a powerful sorcerer so that he temporarily loses his powers. He has to rely on his wits and the help of his friends, who may not be used to him being so vulnerable, to break the curse and regain his strength in time to face a new, powerful enemy.
One idea could be that the OC has a unique gamer system that allows them to level up in real - life skills. For example, they could level up their cooking skills like in a cooking - based game, and as they do, they unlock new recipes and cooking techniques. Another plot could be the OC's gamer system is glitched, and they have to figure out how to fix it while also dealing with the strange in - game - like events that are now happening in their real life.
One idea could be exploring what would happen if a minor character, like Gendry, became the King of Westeros. He has a claim to the throne through his Baratheon blood and his time with the Brotherhood without Banners could give him a different perspective on ruling. Another plot could involve a female character, like Brienne, leading a new order of knights that are dedicated to protecting the realm in a more democratic way. Or perhaps a story where the White Walkers and the humans form an uneasy alliance against a new, even greater threat from Essos.