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.
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.
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.
One possible plotline could be Snape using his position as master to make Sirius work on a dangerous mission for the greater good of the wizarding world, but Sirius is hesitant at first. Another could be Snape teaching Sirius some long - forgotten or dark magic that Sirius has to master under Snape's strict guidance.
Maybe the Hidden Leaf Village is haunted by a slasher who seems to be immune to normal ninja attacks. Naruto would have to not only rely on his physical abilities but also his wits and the help of his friends. He might discover that the slasher has a connection to an ancient and dark ninja art that was long forgotten. This could lead to a race against time to stop the slasher before more lives are lost in the village.
A possible plotline could also involve Naruto finding a hidden connection between himself and Mikoto. Maybe they are related in some way that was previously unknown. This discovery could lead to a whole new arc in the story where Naruto has to come to terms with this new family connection and what it means for his place in the ninja world.
One possible plotline could be Naruto taking on Nagato's role during the Pain arc. He might use Nagato's powers in a different way to bring peace to the village. Another could be Naruto having Nagato's memories and trying to understand his past and motives.
In 'naruto is british fanfiction', one idea could be that the chakra system is related to some sort of British magic. Naruto might discover that his ninja powers have a connection to ancient British magic that was long forgotten. He could then go on a journey to uncover the secrets of this connection, meeting British - inspired characters along the way who either help or hinder him in his quest.
One possible plotline could be Naruto discovers Madara's past in great detail and starts to admire his strength and the vision he once had for the ninja world. He might study Madara's fighting techniques and incorporate some of his strategies into his own combat style. For example, Naruto could be intrigued by Madara's use of the Sharingan and try to find ways to counter it more effectively based on understanding Madara's own approach.
Well, one possible plotline could be that Naruto, being a fan of Megatron, tries to incorporate some of Megatron's leadership and combat strategies into his ninja battles. Maybe he starts using more aggressive and direct combat styles inspired by Megatron's fearless approach in battle. Another idea is that Naruto discovers an ancient ninja artifact that has a connection to Megatron's world, and this leads him on a journey to understand the similarities between his world and that of the Transformers. It could also be that Naruto, in his dreams, meets Megatron and they exchange ideas about power and leadership, which then influence Naruto's decisions in the real ninja world.
Perhaps Naruto becomes homeless due to some sort of misunderstanding or false accusation in the village. He then has to prove his innocence while living on the streets. He could start doing small acts of kindness for the villagers from the shadows, which eventually leads to the truth coming out and him being welcomed back home.