Well, in many Naruto fanfics, the crazy strong aspect often involves unique jutsu combinations. For example, the protagonist might create a new type of Rasengan by combining it with a lightning - based chakra. Also, the character development can be really intense, with characters achieving power levels that are far beyond what we see in the original series in a very short time.
The main protagonist usually stands out. If it's a self - insert type of fanfic, that character might have some OP (over - powered) abilities right from the start. Another could be a reimagined version of Naruto himself, with even more powerful forms of his signature jutsu. And villains can also be very impressive, like a super - strong Akatsuki member who has some new and terrifying powers.
Madara Uchiha could be the cause. Even if he's dead, his influence could still be around. Maybe he left behind some sort of genjutsu or curse that affects Naruto's mind and drives him crazy. After all, Madara was always planning something big and Naruto would be a great pawn if he's out of control.
Well, one interesting aspect could be the unique character interpretations. Fanfic writers often explore different sides of Naruto characters that we might not see in the original series. For example, they might delve deeper into a character's backstory or give them new powers. Another aspect is the different plotlines. It can range from alternate universe scenarios, like what if Naruto was raised in a different village, to completely new adventures with the existing characters.
In a 'naruto goes crazy fanfic', Naruto might start to use his powers in unpredictable and extreme ways. He could go against his usual moral code and attack his friends or allies by mistake, perhaps due to some powerful dark influence or a misunderstanding of a new jutsu he's acquired.
One popular fanfic could be about Naruto discovering his strong wind affinity early on. He might start training with a special wind - based jutsu teacher. This could lead to him creating new and powerful wind - based attacks that no one has seen before.
Power growth is a very common theme. Usually, Naruto gains some kind of super - powerful ability that he has to learn to control. Another theme is the impact on relationships. When he becomes so strong, it often changes how his friends, like Sasuke and Sakura, interact with him.
Good character development is also key. Naruto's character should not be out of character. If he is in a Star Wars crossover, his growth should be consistent with his original self while also adapting to the new environment. His values like friendship and determination should still shine through, but he should also learn from the new characters and situations in the Star Wars universe. And the new characters he meets should also be well - developed, not just there as background.
Perhaps an OC that is a foreign ninja from a far - off land with a completely different fighting style based on music. They use sound waves to attack, defend, and even hypnotize opponents, much like how Jiraiya uses his toad - related jutsu in creative ways.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a large collection of Naruto - related fanfics, including the 'crazy' ones. Just use the search function and type in 'naruto crazy fanfic' or related keywords like 'alternate Naruto story' or 'crazy Naruto adventure'.