A Naruto character would first have to understand the concept of the Force. For example, Naruto himself might initially struggle as he's used to chakra. But his determination could help him adapt. He might use his skills in combat, like his shadow clones, in a new way within the Sith Warrior framework.
To adapt to being the Mandarin, Naruto would first need to understand the nature of the ten rings. He might start by experimenting with each ring's individual power. He'd then figure out how to combine these powers with his existing ninja abilities like rasengan. His relationships with other characters would also change. Some might be afraid of his new power, while others would see it as an opportunity to fight against greater threats. Naruto would have to convince them that he can be trusted with this power and that he'll use it for the greater good.
One idea could be a crossover where a Naruto character somehow gets transported to the Star Wars universe and is mistaken for a potential Sith Warrior. They have to navigate the dark side teachings while also trying to find a way back home.
In fanfiction, Sith coming to Earth would be quite an interesting scenario. They would have to adapt to Earth's climate, which varies greatly from planet to planet in the Star Wars universe. Some Sith might use their powers to manipulate the weather to their advantage. They would also face challenges in terms of hiding their true identities and motives. Since Earth has no prior knowledge of the Force or Sith, they could either use this to their advantage or struggle to fit in without revealing their nature.
He would likely become more ruthless. As a Sith Emperor, Naruto would have to make tough decisions that go against his usually kind - hearted nature. For example, he might have to sacrifice some of his friends or allies for the greater good of his empire.
Naruto would adapt by using his ninja skills. His speed and agility from being a ninja would help him in exploring Earthland. He could also use his rasengan as a powerful attack against any potential enemies. He might start by finding a place to stay and learning about the local customs.
He'd probably start by observing. Naruto is curious, so he'd watch how the Asgardians live, their customs, and how they interact. Then he'd start to adapt by using his ninja adaptability skills.
Well, Naruto's determination could be seen as a Sith - like trait. The Sith value power and Naruto is always striving for power to protect his village. He could be a Sith who uses his shadow clones in a more menacing way, like sending them out to do his dark bidding instead of for good deeds.
The length of the Sith Warrior story can vary depending on how quickly you progress and how much side content you explore. Generally, it can take a significant amount of time to complete the main storyline.
Percy would need to learn how to be stealthy. He's used to fighting out in the open as a demigod, but as a ninja, he'd have to blend into the shadows. He could use his powers over water to create distractions or cover his movements, like making a mist to hide in.
Sasuke would likely be very cautious at first. He'd be observing everything closely, trying to figure out the rules of this strange place. His Sharingan might give him an advantage in seeing through some of the illusions in Wonderland. Naruto, on the other hand, would probably be more excited and jump right into things, ready to make friends with the odd - looking creatures.