Sasuke could be a likely candidate in a sense. Given his skills as a ninja, his Sharingan which gives him an edge in combat and perception, and his past as a sort of 'rogue' ninja. He could be in a situation where Naruto has to hire him for a special mission that requires his unique abilities. Another possibility is Kakashi. He has a vast array of skills, is very intelligent, and could easily take on the role of an assassin if needed, even if it goes against his normal moral code slightly. He would do it for Naruto's sake.
Another theme is identity. Since these characters have a unique bloodline, they often struggle with their identity. Are they just assassins? Or are they also part of the Naruto world with its own values? This is often explored in detail in the fanfics. For example, a character might have to choose between following the traditional assassin ways or adapting to the more peaceful ways of the ninja villages. It makes for some really interesting character development.
One main theme is often power and its acquisition. Naruto, as an assassin, is constantly seeking to gain more power to achieve his goals, whether it's protecting his village or avenging someone. Another theme is secrecy. Since assassins operate in the shadows, there's a lot about hiding identities and motives.
Well, a plot could be that Naruto hires an assassin to eliminate a group of rogue ninjas who are targeting his friends. The assassin might be a former enemy who has a change of heart. They then embark on a journey together, with the assassin teaching Naruto some unorthodox combat techniques. Also, the story could be about Naruto hiring an assassin to stop a dark ritual that is about to be performed in the shinobi world. The assassin has special abilities that are crucial to the success of the mission.
One popular 'naruto master assassin fanfiction' is 'Naruto: The Assassin's Creed'. It combines the world of Naruto with elements of the Assassin's Creed franchise, creating an exciting and unique story. Another one could be 'Naruto: Shadow Assassin', which often features Naruto with enhanced assassin - like skills and stealth abilities.
The protagonist of the book, Naruto's Black Wings, traveled to the Naruto World and became the friend of the fourth Naruto. At the same time, he had to face the dilemma of being appointed as the fourth Naruto. So I recommend Naruto: Black Wings to you. I hope you will like this story full of challenges and adventures. I hope you like this fairy's recommendation. Muah ~😗
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.
Well, there's 'Assassin's Bloodline: Naruto's New Path'. In this fanfic, the main character discovers an ancient assassin bloodline within himself. It dives deep into how this bloodline changes his relationships with other Naruto characters and his role in the village. It's full of plot twists and turns that keep readers engaged.
It could be a really interesting mash - up. Maybe Naruto's ninja skills could be incorporated into the Assassin's Creed world. For example, his ability to run on walls and use shadow clones could be seen as similar to the parkour and stealth abilities of the assassins in Unity. He could be on a mission in the French Revolution setting, using his unique skills to fight against the Templars.