In this fanfiction, it's possible that Naruto is chosen specifically to bear the power of Obelisk the Tormentor. His strong will and determination make him a suitable candidate. As he gains this power, his friends might be a bit wary of him at first. But Naruto, being Naruto, will prove that he can use this power to protect the village and the people he loves. He might even develop new jutsu that combine his ninja abilities with the power of Obelisk the Tormentor.
Perhaps in the fanfiction, Naruto's world is in danger and the only way to save it is by gaining the power of Obelisk the Tormentor. He might initially struggle with the dark nature of this power, but then he figures out a way to use it for good. He could use it to fight against powerful enemies that his normal ninja skills couldn't handle.
Well, it could be that Naruto somehow discovers the power of Obelisk the Tormentor. Maybe he stumbles upon an ancient relic or meets a mysterious figure who bestows this power upon him. Then he has to learn to control it, which might be really difficult as Obelisk the Tormentor's power is extremely potent.
One likely antagonist could be those who oppose Naruto having the power of Obelisk the Tormentor. They might see it as a threat to their own power or plans. Maybe some of the rogue ninja groups or even some of the hidden villages that have their own agendas.
With the Rinnegan, Naruto might gain the power of the Human Path. This would allow him to read minds or rip out souls, which is a very dark and powerful ability that would be quite different from his usual positive - natured powers.
Perhaps it could be about Naruto finding someone who was in a really tough situation, like being forced to work for bad guys. Naruto then 'gains' this person in the sense that he rescues them. After that, the rescued person feels so indebted to Naruto that they become like a self - imposed helper to him, following him around to repay their debt in a non - slavish, more of a friendship - based way.
Well, one possibility is that Naruto's new Sharingan power could give him an edge in battles against stronger foes. He might be able to quickly analyze their moves and counter them more effectively.
Maybe Harry discovers long - lost relatives who come forward after the war. For example, a distant cousin could show up and welcome him into their family. They might share stories about his parents that he never knew.
Well, perhaps Harry stumbles upon the Mandarin's rings in some unexpected way. Maybe he's on an adventure and discovers them in a hidden lair. Then he has to figure out how to use their power without falling under their negative influence.
The staff could be a key to an entirely different form of magic. Harry, upon obtaining it, has to learn a whole new set of skills. It might have the power to control elements, like fire, water, earth and air. With this new power, Harry is not only stronger in his battle against the dark side but also becomes a more well - rounded wizard. He may face challenges in learning to balance the use of his wand and the staff, but in the end, it makes him a more formidable opponent to his enemies.
It could be Orochimaru. Since he has always been interested in obtaining powerful abilities, he might see Naruto with the Sharingan as a threat and try to take it for himself.
If Naruto got the Rinnegan in fanfiction, he would become even more OP (over - powered). His fighting style would be completely different. He could use the Preta Path to absorb chakra attacks, which means he could nullify a lot of his opponents' moves. This would make him a much more formidable foe. In terms of the plot, it might lead to new alliances and rivalries. Maybe some characters who were previously neutral would now see Naruto as a threat, while others would flock to his side to benefit from his new power.
One possible plot development could be that Naruto uses his new - found control of the Nine - Tails to defeat a powerful enemy that was previously unbeatable. He might be able to combine his own ninja skills with the Nine - Tails' power in a more efficient way, like creating new and unique jutsu.