Naruto's ability to create shadow clones would be extremely useful in Assassin's Creed Origins. He could send clones to scout areas, distract enemies, or even perform coordinated attacks. His Rasengan could be a powerful finishing move against tougher foes. Also, his enhanced physical abilities due to his ninja training would make him a formidable opponent in the world of assassins.
Well, Naruto's chakra control would be a very interesting addition. In Assassin's Creed Origins, he could use it to enhance his climbing and parkour skills, allowing him to reach places that normal assassins might struggle with. His Nine - Tails chakra, if harnessed in the right way, could give him an edge in combat, like increased speed and strength. He could also use his ability to sense chakra to detect hidden enemies or secrets in the environment, much like the assassins' Eagle Vision.
In a fanfiction, Naruto's abilities would blend in quite uniquely. His ninja skills of stealth, which he has developed over time, would be on par with the assassins' skills. However, his unique jutsu would set him apart. For instance, his transformation jutsu could be used to infiltrate enemy strongholds by disguising himself as one of the guards. His summoning jutsu could call upon powerful creatures from the Naruto world to aid in battles or to traverse difficult terrains. And his ability to endure and keep fighting, even in the face of tough odds, would be an inspiration to the assassins in Assassin's Creed Origins.