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.
Perhaps a character from a far - flung wizarding community that has different moral codes. They come to the main wizarding world of Harry Potter and their assassin - like skills make them a force to be reckoned with. They might initially be seen as a threat but later prove to be an ally against a common enemy.
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 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.
Perhaps an international wizard who has been trained in both magic and martial arts in some far - flung magical school. This wizard - assassin has his own code of ethics and when he meets Harry, he decides to take him under his wing, believing that Harry can be a force for good in a different way than the traditional Hogwarts - trained wizards.
It could be a rogue Death Eater who has mastered a new form of invisibility spell. This Death Eater might be seeking revenge on those who opposed Voldemort.
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.
One possibility could be a rogue Death Eater. They have the skills and the inclination towards dark magic. For example, Bellatrix Lestrange could have easily fit the role of a dark assassin. She was extremely powerful and had no qualms about using dark magic to achieve her ends.
You can expect a whole new set of adventures. Instead of the usual Hogwarts - related challenges, Harry will be facing assassin - like missions. There might be more sneaking around, using magic for covert operations. And his relationships with other characters could also change. For example, his friends might be more in the dark about his new activities, adding a layer of mystery to the story.
" The Divine Throne " was a popular fantasy novel written by the three young masters of the Tang family and published on Qidian Chinese website. The story described the protagonist's ambition to become a Divine Knight from a young age, fighting against the Demon God and gradually growing up. This novel can be read or listened to on the Qidian Reading App. Now, you can also get an experience member by going to Qidian Reading App. The Qidian Reading App provided authentic books and audio recordings. The male lead was Long Haochen, brave and upright, attentive and warm, with both courage and wisdom, possessing extraordinary talent. The female lead was Sheng Cai 'er. She was cold and mysterious, and was especially gentle to Long Haochen, while her strength was extremely formidable.
The master of the Divine Throne Assassin Temple was Sheng Yue.
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.