In a fanfiction where Naruto becomes Obito, it could be due to an outside force. For example, an ancient evil entity that wants to disrupt the balance of the ninja world. It targets Naruto and messes with his mind, implanting Obito - like thoughts and desires. Naruto would then struggle between his original self and this new, Obito - influenced persona, leading to many internal and external conflicts within the story.
Well, Naruto could gain the power of the Juubi in many ways. Maybe through some ancient ritual or a powerful enemy's defeat that transfers the Juubi's essence to him. Once he becomes the new Juubi, his physical abilities would skyrocket. He'd have even greater chakra reserves and strength, allowing him to protect the Hidden Leaf like never before.
If Naruto becomes a villain in the DC crossover, he might set his sights on Superman. Naruto could believe that Superman's power is a threat to the balance he wants to create. He would use his ninjutsu to try and take on Superman. For example, he could use his Rasengan, a powerful spinning ball of chakra. However, Superman's strength and heat vision would be tough for Naruto to overcome. This would lead to an epic battle between the two, with the other DC heroes and Naruto's possible allies getting involved as well.
Well, in such a fanfiction, Naruto being a Kryptonian would mean he has heat vision. This new power could be used in battles against the Akatsuki. Instead of using Rasengan, he could simply use his heat vision to take out opponents. Also, his invulnerability would make him a force to be reckoned with. He could walk through most attacks without a scratch. His character might also change as he has to deal with these new powers and the responsibility that comes with them. It's an interesting concept that would mix the Naruto world with the Kryptonian lore.
Well, if Naruto were to create an Akatsuki fanfiction, one way the storyline could develop is by having Naruto try to understand the motives of the Akatsuki members more deeply. He might explore the idea of redemption for some of them. For example, he could write about how Pain, after seeing the destruction he caused, might have a change of heart. Naruto could also create scenarios where the Akatsuki members interact with the villagers of Konoha in a more positive light, like how Sasori could use his puppet - making skills to help the kids in the village create toys instead of weapons.
Well, in this fanfiction, Naruto might become a chef because he wants to bring people together through food. Since he's always been about unity, he could start a small eatery where people from different villages can come and enjoy a meal. He'd probably make dishes that are inspired by his travels. He could incorporate different elements from the places he's visited during his ninja missions. Also, his friends like Sasuke and Sakura might be his first customers and give him feedback. Naruto would be the kind of chef who puts his heart into every dish, just like he put his heart into protecting the village.
One possible storyline could be that Naruto, through some strange dimension - hopping incident, ends up in the One Piece world. There, he witnesses Doflamingo's power and charisma from afar. Doflamingo's ability to control and manipulate situations might intrigue Naruto, who has always been about facing strong opponents. He starts to study Doflamingo's tactics and gradually becomes a fan, trying to incorporate some of Doflamingo's strategic thinking into his own battles, all while still maintaining his core values from the Naruto world.
It could start with Naruto being sent on a mission to an unknown realm. There, he meets someone who is very much like the Red Hood. They team up and Naruto learns about the Red Hood's ideology. Over time, he realizes that he can better protect this new world by becoming like the Red Hood. He would then start training in the Red Hood's combat style while still having his ninja abilities as an advantage.
Another plot could be that Naruto is tricked into believing a false narrative about the ninja world. Similar to how Obito was manipulated by Madara's lies. He then starts to act in ways that are contrary to his usual self. He might target the other villages, thinking he is doing the right thing for some grand, but misconstrued reason. This would lead to him being at odds with his former friends, who would be desperate to bring the old Naruto back.
It could change it a great deal. For one, Obito might not be as much of a villain. His alliance with Naruto could lead to a united front against Madara much earlier. This would mean less destruction and death in the ninja world. Also, Naruto would have a powerful ally who has a deep understanding of the Sharingan and its powers. They could develop new jutsu together, changing the power dynamics in battles.
One way this could develop is through some kind of magical or unforeseen circumstance. Maybe there's a strange jutsu that binds their fates together. For example, a powerful enemy uses a forbidden jutsu that causes Naruto and Tsunade to be in a situation where they have to protect a new life that is created as a result. Naruto's strong sense of responsibility and Tsunade's maternal instincts (which she has buried deep due to past traumas) could start to surface as they deal with this new situation. They would face many challenges, from the reactions of the Hidden Leaf Village to the difficulties of raising a child with their busy lives as shinobi.