It could be the main protagonist if the story is written in a way that the character manages to control and utilize all the Akatsuki powers effectively. With the combined powers, they would have a vast array of abilities at their disposal, making them extremely formidable.
There might be an original character created in the fanfiction who is designed to be the ultimate wielder of all Akatsuki powers. This character could be a long - lost relative of the Akatsuki members or someone with a special connection to their powers. They would have trained specifically to handle the combined powers, and thus be more powerful than anyone else in the story. Their power would be a blend of the diverse Akatsuki abilities, like being able to summon the powerful beasts that some Akatsuki members are associated with, while also having the ability to use the unique ninjutsu of others.
Often, in these types of fanfictions, an antagonist who steals or is given all the Akatsuki powers becomes the most powerful. They don't have the moral constraints that a protagonist might have, and can use the powers in more ruthless ways. For example, they could use Pain's ability to rain down destruction on villages without hesitation, combined with Itachi's mind - controlling illusions to subdue any opposition.
Well, it could be that there's a plot device like an ancient artifact. This artifact might have the power to draw out and combine the Akatsuki powers. The Akatsuki members themselves might be tricked into contributing their powers to this artifact, and then the protagonist or an antagonist gets hold of it and gains all those combined powers. It's a common trope in fanfiction to use such magical or mysterious items to bring about extraordinary power combinations.
Konan is often very popular. Her paper - like abilities are really cool and in fanfiction, she can be portrayed in many different ways, like a more sympathetic figure who is just caught in a bad situation.
If you combined Naruto's determination and power - up abilities with the Otsutsuki's unique dojutsu and chakra - related powers, and then added the Akatsuki's knowledge of various jutsu and their strategic thinking, it would be an extremely powerful character. Naruto already has the Nine - Tails' chakra and his Sage Mode. The Otsutsuki have things like the Rinnegan. And the Akatsuki members are no slouches in combat either. So this combined character would be able to take on just about any foe.
One potential consequence could be a shift in the power balance. Naruto was already a strong force, but with Akatsuki powers, he could become nearly unbeatable. This might make other villages either fear him or try to ally with him more strongly. Enemies of Konoha might think twice before attacking. Also, the Akatsuki's powers often come with a certain darkness, so Naruto might have to struggle with that aspect of his new abilities.
Pain would be one of the most challenging. His Rinnegan gives him a wide range of powerful abilities like the Six Paths of Pain. Naruto would have to figure out how to counter each of those paths and find a way to reach the real Pain. Itachi is also tough. His Sharingan and genjutsu skills are top - notch. Naruto would need to break free from his genjutsu and then find a way to fight back against his fire - based attacks.
Since the Akatsuki often deals with sealing techniques, Naruto's skills with the Nine - Tails' seal could be enhanced in a different way. He might learn to better control the Nine - Tails' power without relying on the methods taught in Konoha. Also, his physical abilities could be trained differently. Maybe he'd focus more on speed and stealth, which are qualities often valued by the Akatsuki.
If Naruto was raised by the Akatsuki, his powers would be a blend of his natural talent and the Akatsuki's influence. He may have developed some of the same skills as the Akatsuki members, like better control over the elements in a more sinister way. His Nine - Tails chakra could be used to intimidate and dominate rather than protect. Also, he might have learned to use his shadow clones for more devious purposes, such as spying or setting traps. His power growth would be shaped by the Akatsuki's motives of obtaining power and wealth through any means necessary.
There are some characters in Naruto fanfiction who possess the power of omniscience. They know everything that has happened, is happening, and will happen in the Naruto world. This makes them extremely powerful as they can predict every move of their opponents. Another type of powerful character is one with the power of absolute invincibility. No attack can harm them, and they can move freely through any obstacle. Some fan - created dark - side characters with supernatural powers like draining the life force of others to gain immortality are also considered very powerful.
Pain's rinnegan power would be an amazing addition for Naruto. The rinnegan has so many abilities like the six paths. Naruto could use these powers to better understand the world and help people on a larger scale. He could use the power of the Deva Path to manipulate gravity, which would be useful in both combat and for things like building infrastructure in the village. Also, the rinnegan's connection to the afterlife could give Naruto new insights into the spirits and souls, which could be relevant in his interactions with the Nine - Tails and other spirits in the Naruto universe.
One of the most popular female characters in Akatsuki in fanfictions is Konan. Her unique paper - based abilities and her complex relationship with Nagato and Yahiko make her a fascinating subject. In many fanfictions, her backstory is explored more deeply, especially her time growing up in the war - torn land of Amegakure. Another popular one could be Karin. Her connection to Sasuke and her own powers as a sensor type ninja give a lot of room for fanfiction writers to create interesting storylines, like her dealing with her feelings for Sasuke while being involved with the Akatsuki.