In this fanfiction, Naruto might join Madara because of some sort of time - travel or alternate reality situation. He could find himself in a world where Madara's actions seem more justifiable. Naruto, being Naruto, would still strive for peace. So he might try to guide Madara towards a more peaceful solution while being part of his group. This could create a really unique dynamic where Naruto is constantly trying to nudge Madara in the right direction while also dealing with the other members of the group who may not be as open to change.
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.
One possible plotline could be that Naruto, heartbroken from a failed relationship or the loss of a dear friend, throws himself into the dangerous and secretive world of ANBU to numb his pain. He might start off as a reckless agent, but gradually find purpose in protecting the village in a more covert way. This could lead to him making new, deeper friendships within the ANBU ranks.
Perhaps the female Naruto joins Orochimaru because she wants to learn more about the secrets of the ninja world that she believes Orochimaru can unlock. She may be curious about the darker aspects of ninjutsu that are not taught in the normal ninja academies. But then she discovers that Orochimaru is using her for his own immoral experiments. She then teams up with some of Orochimaru's former followers who also want to break away and they plot to take him down from the inside.
Well, perhaps Naruto and Sasuke are forced to join Orochimaru. Maybe Orochimaru has some kind of leverage over Konoha that makes them comply. In this fanfiction, they could start to learn unique jutsus from Orochimaru but also have to constantly resist his more evil intentions. They might also meet some interesting characters within Orochimaru's lair.
One possible plotline could be that Madara's great - grandson discovers a hidden power within himself. Maybe he finds an ancient scroll left by Madara that contains a unique jutsu. He then has to train hard to master this jutsu while also facing off against new enemies who want the power for themselves.
One possible plotline could be Naruto having to deal with the memories and powers of Madara suddenly awakening within him. He might struggle to control the dark and power - hungry side of Madara that comes with the reincarnation. This could lead to a conflict within the Leaf Village as they see Naruto changing.
In a 'Naruto brother of Madara fanfiction', a plotline might involve Naruto using his connection to Madara to bridge the gap between the Uchiha clan and the rest of the village. Since he has a different upbringing compared to Madara, he could bring a fresh perspective to the Uchiha's grievances. Another interesting plotline could be that Naruto discovers he has some latent Uchiha abilities due to his relation to Madara. This could lead to him training in new ways and developing powers that are a blend of his Uzumaki and Uchiha heritage. There could also be a plot where Madara's past actions are re - evaluated in light of his relation to Naruto. Maybe there were reasons behind his actions that Naruto uncovers, which could lead to a redemption arc for Madara.
One possible plotline could be Naruto being influenced by Madara's ideology and starting to question the traditional ways of the Hidden Leaf. He might start to think that a more forceful approach is needed to achieve true peace, similar to Madara's view. Another plotline could be Naruto somehow inheriting some of Madara's powers or abilities and having to deal with the consequences. This could lead to a power struggle within himself as he tries to balance his own nature with the new - found Madara - like qualities.
One possible plotline could be exploring their shared heritage. Maybe they discover they are brothers early on and team up against the darker forces in the Naruto universe. They could use their combined powers to bring about a new era of peace in the shinobi world.
One possible plotline could be that Sakura is in a dangerous battle against a powerful enemy. Madara, who might be an unexpected ally, steps in. He uses his powerful jutsu to fend off the enemy and saves Sakura. Maybe Madara has his own reasons, like seeing Sakura's potential or having a newfound respect for her skills.