Perhaps in the fanfiction, Naruto's violet eyes are linked to an ancient prophecy. The prophecy states that a person with such eyes will bring either great destruction or great peace. Naruto, being Naruto, wants to ensure it's the latter. So, he starts training harder than ever to control his new - found powers associated with the violet eyes. He might meet a mentor who has some knowledge about these eyes and guides him. This could lead to new alliances and also new enemies who either want to use Naruto for their own gain or stop him from fulfilling the prophecy.
One plot idea could be that Naruto's violet eyes are a sign of a hidden bloodline. This new bloodline gives him unique powers, like the ability to see chakra in a more detailed way. For example, he can detect different types of chakra from long distances, which helps him in battles and in finding enemies. Another idea is that the violet eyes are a result of a curse. As he tries to understand the origin of the curse, he uncovers dark secrets about his family or the village's past. Maybe he has to go on a journey to break the curse, facing many challenges along the way.
One plot idea could be a story where a young ninja discovers they have received Shisui's eyes through some mysterious means. They then have to learn to control the unique powers of the eyes, like the powerful genjutsu abilities. This could lead to them being hunted by those who want to use the eyes for evil purposes.
One plot idea could be that Naruto's mystic eyes allow him to see the true nature of chakra. He can detect hidden traps or illusions that are based on chakra manipulation more easily. For example, in a battle against a powerful enemy who is skilled in genjutsu, his mystic eyes would give him an edge as he can see through the false chakra constructs of the genjutsu and counterattack swiftly.
One idea could be that the character with the Mystic Eyes of Death Perception is an outsider in the Naruto world. They can see the 'lines of death' on the powerful bijuu, which causes a stir among the ninja villages as they fear this new power. Another plot could involve using these eyes to find a hidden curse in the chakra system that is slowly killing a well - known ninja, and the journey to find a cure.
Well, a plot could be centered around a group of rogue ninjas who steal the power of the Demon Eyes Kyo. They then use it to start a war between the different ninja villages. Naruto and his team have to track them down and take back the power. Or perhaps the Demon Eyes Kyo is a power that can only be used by those with a pure heart, and a character who has been ostracized for being different discovers they are the only one who can use it to save the world from a dark force that is spreading across the land. Another idea is that the Demon Eyes Kyo has the ability to open portals to other dimensions, and Naruto has to enter these dimensions to stop an evil from there that is trying to invade the Naruto universe through the power of the Demon Eyes Kyo.
One idea could be a story about a trainer who discovers a rare and powerful Pokemon that has the ability to change forms in unique ways, not seen in the regular game. This Pokemon could be the key to solving a mystery in the Paldea region, like why certain areas are experiencing strange weather patterns. Another plot could focus on a group of friends who enter a secret, uncharted part of the region while on their Pokemon journey and find a new type of Pokemon that they must protect from poachers.
One idea could be that Tony and Violet team up to solve a mystery in their neighborhood that the regular police can't handle. Maybe there are strange disappearances and they use their unique powers - Tony's tech skills and Violet's invisibility and force fields - to uncover the truth.
Maybe his special eyes allow him to see into the past. He could witness the great ninja wars as if he were there. This would help him understand the history of the ninja world better and gain wisdom from the past. He might see how his father, Minato, fought in the wars and learn new jutsu from those memories.
One plot idea could be that Tony discovers a new power within Violet that she herself is unaware of. Maybe it's a power that only emerges when she's in a state of extreme emotion related to Tony. This could lead to a whole adventure where they explore this new aspect of her abilities together.
Maybe the Eyes of Death are actually the eyes of a long - forgotten magical creature. In the fanfiction, this creature has a connection to Harry's past, perhaps his family. Harry has to figure out how to communicate with the creature through its eyes to gain its power and use it against the Dark forces.
One idea could be to write about a trainer who discovers a new and rare Pokemon in an uncharted area of the Pokemon Violet region. This Pokemon could have unique abilities that change the way battles are fought in the game's universe.