It could be really interesting. Naruto's skills and his determination could be channeled into the role of an assassin. Maybe he'd use his shadow clones in new and sneaky ways to complete his assassinations. His rasengan could be a deadly finishing move in a stealthy kill.
A 'Naruto is an Assassin' fanfic would likely involve Naruto having to operate in the shadows. He might be given targets to eliminate for some greater good or because of some political intrigue in the ninja world. His relationships with his friends would change as he couldn't be as open about his new activities. His natural speed and agility would be enhanced for the purpose of assassination. And perhaps he'd have some new, more lethal jutsus developed specifically for his assassin role. The fanfic could also explore the moral implications of Naruto becoming an assassin, whether he's still the same hero we know or if this new path would corrupt him in some way.
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.
It could be about Naruto using his ninja skills in a modern world as an assassin. Maybe he'd be hired by secret organizations to take out bad guys who are threats to society. He'd use his signature jutsus like the Rasengan in modern settings, like in big cities or corporate buildings.
He would probably face other assassins. In the modern world of this fanfic, there could be a whole underground network of assassins competing for contracts. Naruto would have to outwit them to get the jobs he wants or to protect his own life. There could also be powerful criminal organizations that he has to take on. These organizations might have advanced weaponry and security systems that Naruto would need to bypass.
It could be a really wild and interesting mix. Imagine Naruto's ninjutsu in the high - energy world of Highschool DxD, with some assassin - like characters from different backgrounds thrown in. Maybe the story could revolve around a character who has the skills of an assassin, the chakra powers of Naruto, and has to navigate the crazy school life and battles in the Highschool DxD universe.
It could be really exciting. Naruto's energetic personality would translate well into a stage presence. He'd probably be a very passionate singer, pouring all his emotions into his performances. His backstory as an orphan might also add depth to his music, as he could sing about themes of loneliness and the search for family and belonging.
A 'naruto is introverted' fanfic would probably show Naruto being more reserved. He might not be as quick to jump into action or make loud declarations. Instead, he could be shown thinking things through more carefully in his own mind before acting. For example, his interactions with his friends would be less boisterous and more subdued.
A 'Naruto is a firebender' fanfic would be a unique blend of two different worlds. Naruto's existing relationships in his own world would be affected by his new ability. His friends might be both amazed and a bit wary of his fire - bending. The story could explore how he uses this power for good in his own village or in the wider ninja world. It could also involve him facing new enemies who are attracted to or threatened by his fire - bending powers, and how he overcomes these challenges with his ninja and fire - bender skills.
A 'Naruto is Meliodas' fanfic could be really interesting. It might combine Naruto's world of ninjas with Meliodas' world of demons and magic. Maybe Naruto would have Meliodas' powers, like his ability to use the Demon Sword. And his personality could be a mix of Naruto's determination and Meliodas' more laid - back but powerful nature. It could also involve Naruto's friends and enemies interacting with characters from the Seven Deadly Sins universe in unique ways.
It could be really interesting. Naruto is known for his determination and growth, while Escanor is extremely powerful and has a unique personality. In the fanfic, Naruto might gain some of Escanor's powers like his incredible strength during the day. Maybe Naruto would use these new powers to protect his village in a different way. It could also explore how Naruto's friends in the Hidden Leaf Village would react to his new powers and this new side of him.
Well, it could have Naruto characters using Assassin's Creed skills like parkour. For example, Naruto could be running across the rooftops of Konoha in the same fluid way as an Assassin. Maybe Sasuke would be like an assassin with his stealth and quick strikes.