Jiraiya could be an interesting assassin master. He already has a lot of knowledge and skills that he could pass on to Naruto in a more assassin - like way. His experience in espionage and combat would make him a great fit.
It could be a former Auror who has turned to more shadowy ways of dealing with threats. After seeing the inefficiency of the Ministry's methods in some cases, they decide to take matters into their own hands and become a sort of assassin to target dark wizards.
It depends on your taste. If you like the idea of Harry Potter in a completely different and edgier role like an assassin, it could be interesting. However, some purist fans might not like this deviation from the original concept of the series.
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.
Maybe the assassin master has a hidden past related to Naruto's family. So, the story could revolve around uncovering this mystery while Naruto trains under him. This would add depth to Naruto's character development as he learns about his family's secrets.
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.
Yes, I recommend "Homme Fatale: Black-bellied Concubine". The female protagonist Wuxin was the most cruel and cold-blooded killer in the 21st world. She was reborn and transmigrated to become the master of the Ghost Palace, Yue Yingwan. She was called "Homme Fatale" by the martial arts world. Her martial arts and wisdom were the best in the current generation. She roamed the immortal island and her divine sword was invincible. What could the venerable devil do to her? This book was an ancient romance novel. I hope you like this fairy's recommendation. Muah ~😗
I recommend this novel, This Princess is Here. The female protagonist is a powerful martial artist and a high-ranking female Hades in the martial arts world. The male protagonist is a man who only wants to protect her. It belongs to the type of strong woman and strong man, which fits the plot you described. I hope you like my recommendation, Mwah~
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.
One interesting plot could be that the main character, who has assassin skills, is secretly protecting Hogwarts from a new and unknown dark threat that the regular wizards can't detect easily. They use their unique combat skills along with magic to keep the school safe.