One possible plotline could be that Naruto is constantly rejected by the village he is trying to protect. This betrayal and lack of acceptance could gradually turn him dark. For example, if the villagers start to blame him for every bad thing that happens, even when it's not his fault. Another plotline might involve Naruto losing someone very close to him, like Sasuke, in a way that he blames the shinobi world for. This could lead to him deciding to take revenge on the world and turn to darker methods of achieving his goals. Maybe he starts to use forbidden jutsu without hesitation, seeing it as a means to an end.
In a 'naruto becomes dark naruto fanfiction', a plotline could be centered around Naruto being influenced by a powerful and evil entity. This entity could slowly corrupt his mind, making him question his values. For instance, it could make him believe that power is the only thing that matters and that the end justifies the means. As a result, he might start to oppress those who are weaker, which is a complete turn from his original character. He could also form alliances with villains he once fought against, all in the pursuit of greater power.
A possible plotline is that Naruto discovers some dark secrets about the Hidden Leaf Village. Maybe he finds out that the village leaders have been using him all along for their own purposes. This realization could shatter his faith in the village and his ideals. He might then decide to take matters into his own hands and create his own version of justice, which is much darker. He could start by taking over the village in a more forceful way, rather than through the love and acceptance he originally sought. He could also change his appearance to reflect his new dark self, perhaps with darker clothing and a more menacing look.
One possible plotline could be that Naruto discovers a hidden jutsu or artifact that grants him immortality. He then has to deal with the consequences of living forever, like seeing his friends and loved ones age and die while he remains the same. Another could be that an enemy tries to steal his immortality, leading to a great battle.
One possible plotline could be that Naruto is somehow transported to a world where sorcery is the main power source. He then has to learn to become a sorceress to survive and find his way back home.
One possible storyline could be that Naruto is betrayed by those he trusts most in the village. This heartbreak and sense of abandonment could lead him down a dark path. He might start to question the values he was taught and use his power in more self - serving and ruthless ways.
Perhaps Naruto starts to question his own identity. Since he was abandoned by his family, he could be on a journey to discover his true heritage and in the process, his dark side grows as he faces many hardships and betrayals. He may then use his new understanding to either wreak havoc or find a way to forgive and move forward.
Perhaps Naruto discovers some dark secrets about the ninja world that make him lose faith in the ideals he once held. He then uses his skills and knowledge to create his own order, ruling with an iron fist as a 'dark master'. He could also form alliances with other anti - hero or villainous characters from the Naruto universe.
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.
One possible plotline could be a situation where Naruto is split into two versions of himself, maybe by some sort of jutsu gone wrong. And as they get to know each other better, they end up kissing as a way to reunite or merge back into one. Another could be in a dream sequence where Naruto is exploring his self - worth and in this dream, he kisses his own reflection which then turns into another version of himself.
A plot could revolve around a dark force corrupting both Naruto and Hinata. This force might be an ancient evil that has been dormant for years. As Dark Naruto and Dark Hinata, they might target their former friends. Naruto could use his shadow clones in more menacing ways, and Hinata could use her Gentle Fist techniques to cause harm instead of protect. They could form an alliance with other outcasts or villains in the Naruto universe.
Well, sometimes in 'naruto vs dark naruto fanfiction', a cool plotline is when Dark Naruto has some new powers that Naruto has to figure out how to counter. For example, Dark Naruto might be able to control shadows in a way that Naruto has never seen before. Or perhaps Dark Naruto has allied himself with a powerful dark force from outside the ninja world. Naruto then has to not only battle his dark self but also this new threat.
Another plotline could be that Naruto travels to the future in his fox form. In the future, Konoha is in ruins. He then has to figure out what led to this disaster using his fox - enhanced intuition and time - travel knowledge. He could then go back to his own time and take steps to prevent the events that led to the future's destruction. This would involve him facing new enemies and making tough decisions along the way.