This chapter will describe all the abilities of the main characters. For Naruto, it lists everything that I've come up with. For Hinata, Sasuke and the Jinchurikis, it's mostly to explain how they would gain their abilities. I would go into more details with whoever wants to take this story.
Naruto:
So I explained how Naruto gets Tailed beast mode a lot earlier. Before all of that, he learns sealing jutsu an kenjutsu from when his clan was still alive, and of course he still uses the shadow clones. He utilizes wind chakra and uses techniques that attribute to the cutting power and force of wind. In addition to carrying a sword, he uses a blade and chain, similar to that of Scorpion from Mortal Kombat, inspired to him by the adamantine chain technique from his clan. He can even use wind to control the trajectory of the chain.
After he gains control of his tailed beast chakra, he trains to combine it with wind chakra, adding some cutting power and allowing him to control the chakra as if it were the wind. He also utilizes the speed attribute for when he faces of Minato.
Naruto has his arms covered in bandages with seals on them that take chakra and give them solid shapes, specifically into weapons. Using these seals, he can make weapons out of the Nine tails chakra, mainly swords and the chain, and by adding wind chakra, he can make swords that can cut through just about anything, including other forms of chakra, which by extension can also nullify jutsu.
When Naruto stole the Uzumaki scroll, he also took a special kind of ink that he can feed chakra into to expand it in quantity and control the trajectory to take the form of a seal. Exactly like how Minato can place seals through touch alone, only on a larger scale, and by using the nine tails chakra, Naruto has a much more fluid control of the ink, allowing him to create seals at near instantaneous rate.
Hinata:
In this fanfic, Hinata broke out of her shy nature at a much earlier age, so her confidence was never trampled by her clan and she grew to be the top kunoich of her class.
At some point during the invasion from Orochimaru, she was badly injured and was left comatose. Naruto has has feelings for Hinata, and the first thing he does when he gains the Nine Tails chakra is to use it to help her.
He uses a chakra transfusion seal on Hinata, sort of like a pseudo eight trigram seal, to temporarily store a portion of the nine tails chakra to heal her. It worked, but with an unexpected outcome.
The nine tails chakra within Hinata fuses with her chakra, focusing on her Byakugan eyes. Eventually, the two different chakras merge into one, and Byakugan evolves into the Tenseigan.
The logic behind this is that Hinata's combined lineage makes her chakra the closest that's identical to Homura's, enough that she has the potential to unlock the Tenseigan, which is fueled by the nine-tails chakra since the Nine tails is one piece of the Divine tree that Homura's power originates from.
The main power of her Tenseigan will focus on Chakra control, having advance versions of the hyuga tecniques, as well a fighting style that involves taking her opponent's attacks and reflecting them back.
Sasuke:
With Sasuke, I have an idea to turn him into something of a dark sage through his curse mark. Jiraya, being a sage and having tracked down Orochimaru, he has considerable knowledge of the curse mark, and has a theory about a more effective way for someone with a curse mark to become stronger. Ordered by the council, he takes Sasuke to as a student to test his theory.
He explains to Sasuke all about Senjutsu and describes the curse mark as a bastardised version, being composed of a substance that acts as conductor of nature energy, similar to the toad oil, allowing it's bearer to absorb it within them at will. The difference however is that with the curse mark, it more like the energy is being forced in, corrupting it, and at a certain point it corrupts the body of the bearer, explain the transformations that people undergo at the second stage.
When nature energy remains corrupted, it stays separated from the main body, so while still a considerable boost of power, it isn't as powerful as the real thing. Basically, the curse mark trades efficiency for easier access.
Jiraya's theory is that a bearer of the curse mark has control over the mark, but not the energy itself, and when they draw in the energy, and without direction, it only fills up the body with a maximum amount that it can wistand. If a bearer can sense nature energy like a sage could, than they might be able to control it.
Sasuke goes through the sage training long enough for him to gain the sense, and when he does, he proves Jiraya's theory to be correct.
Not only can he draw in the energy, he can channel it out to, enhancing all of his jutsu to an even greater power and control, having access to an unlimited amount of nature energy.
He then trains to use the energy on his sharingan, unlocking the mangyeko whenever he does.
The Jinchurikis:
As I mentioned, Naruto sets out to find other Jinchuriki to join him on his cause, as he will need their powers for his plan to work. This group would have to have five members, one for each the five great villages.
He starts by seeking out Gaara, and from there they find two runaway Jinchuriki, Roshi of the four tails and Utakata of the six tails. With each Jinchuriki he finds, Naruto would use the same method he used on himself to give them full access to their tailed beast chakra, along with unique abilities that comes with it.
Not sure about the name of this group yet, but they would distinguish themselves by one of the five elements that they have a mastery of, Naruto being wind, Gaara being earth, Roshi being fire, and Utakata being water.
The final member would be an OC charater to represent lightning, a rough cloud ninja with lightning techniques, who's confident in their plan and want to be a part of it, and they in turn make this character into a Jinchuriki with the reformed three tails.