One possibility is that Naruto uses his shadow clone jutsu in a new and devious way for assassinations. He could send clones to gather intelligence, and when the time is right, he strikes with his signature rasengan in a stealthy manner. Maybe he would also learn new techniques from the world of assassins, like silent movement or poison use, all while still maintaining some of his ninja values like protecting his friends and village.
In a fanfic where Naruto becomes an assassin, he might use his ninja skills in a more stealthy and lethal way. His signature jutsus like the Rasengan could be modified for assassination purposes. For example, he could make it smaller and more concentrated to strike vital points precisely.
His relationship with Sasuke would be very different. Instead of just competing in terms of strength, they might become rivals in the world of assassination. Sasuke's own dark path could either align or clash more intensely with Naruto's new role. And with Sakura, Naruto might be more distant as he delves deeper into the assassin world. She might be worried about the changes in him.
Naruto would need to learn stealth skills. This includes moving quietly, which he isn't really used to as he usually charges in. He'd also have to master the art of disguise so he can get close to his targets without being recognized. Another skill is silent killing. He has to be able to take out his enemies without making a sound, which is very different from his normal combat style of big, flashy attacks.
If Naruto becomes an assassin in fanfiction, his character would likely have a very different development. He might start to rely more on stealth and secrecy rather than his usual head - on approach. His values would also be put to the test. For example, Naruto has always been about protecting and saving lives, but as an assassin, he would have to take lives. This internal conflict could be a major part of his character arc. He may also develop new skills like advanced camouflage or silent killing techniques, all while trying to hold on to some part of his original self.
In this fanfiction, Percy could be an assassin who is on a quest to find a powerful artifact. This artifact was stolen by a rival group and is being used for evil purposes. He travels across different lands, using his assassin skills to gather information, fight off enemies, and finally retrieve the artifact to save the world.
One idea could be that Altair, after being hurt as a kid, is taken in by an assassin. He trains hard to overcome his pain and fear, gradually becoming a skilled assassin. He might have a mentor who helps him channel his anger into his training and missions.
Perhaps a mysterious figure who has been observing Sakura from the shadows. This person, for some reason, decides to train her to be an assassin. He could have some ulterior motives, like using Sakura for a grander plan, but still teaches her valuable skills along the way.
One key plot point could be Sakura's training. She might start from being a novice, learning various assassin skills like stealth, combat, and weapon handling. Another point could be her first mission. It could be a dangerous one where she has to prove herself. Also, her relationships with other characters in the assassin world, whether they are mentors, rivals or allies, would be important in shaping the story.
Well, perhaps Percy starts off as an ordinary character but gets drawn into the chaos realm. He could be forced to become an assassin due to some threat to his friends or family. Maybe he discovers new powers that make him suitable for this role.