One way Naruto could be like Joker is in their complex personalities. Naruto starts off as an outcast in his village, much like how Joker is an outcast in Gotham society. Naruto has a wild and unpredictable side to him which can be compared to Joker's erratic nature. Also, both characters are on a kind of journey of self - discovery, though in very different worlds and with different goals.
One way Naruto could be like the Joker in fanfiction is in their appearance transformation. The Joker has his distinct look with his pale face and wide - grin makeup. In fanfiction, Naruto could be given a similar kind of transformation where his appearance takes on a more menacing or chaotic look. His behavior could also change to match this new look, becoming more erratic and difficult to predict, just like the Joker.
Well, he might start to have a more unpredictable nature. Maybe he'd play pranks on his friends in a more extreme and unhinged way, like the Joker's chaotic actions.
Another plotline could involve Naruto being influenced by an external force that makes him adopt the Joker - like mentality. He could start to form his own 'gang' of sorts, made up of outcasts and misfits in the village. Together, they could start to undermine the authority of the village elders, just like the Joker undermines the power structure in Gotham. This could lead to a series of conflicts between Naruto's group and the traditional shinobi forces in the village.
If Naruto is like Joker in fanfiction, the plot could develop in a way that Naruto starts to create his own brand of 'justice' which is very different from what the ninja world is used to. He might target corrupt ninja leaders or those who abuse their power. This would lead to a lot of chasing and hiding, as the ninja establishment would see him as a threat. His friends would be divided in their opinions about him - some might support his new ways, while others would oppose him.
If Naruto becomes like Joker in fanfiction, it would be a really strange and interesting transformation. Naruto is known for his positive and determined nature, while Joker is chaotic and unpredictable. Maybe Naruto would start to question the values of his village and act in more devious ways. His friends might be very confused and try to bring the old Naruto back.
Maybe there's a plot where Naruto is influenced by an external force that makes him act like the Joker. He then starts to target the powerful figures in the ninja world, not to defeat them in a traditional sense, but to expose their weaknesses and make them look foolish, just like the Joker does with Batman. And as he does this, his relationships with everyone around him start to crumble.
The fanfic may also show Naruto with a more sardonic sense of humor, which is a characteristic of the Joker. Instead of his usual positive and sometimes naive outlook, he could be more cynical. This could change the way he interacts with his friends and enemies alike. For instance, his banter with Sasuke might become more edged and full of hidden meanings, much like the Joker's conversations with Batman, which are full of mind games.
If Naruto becomes a Joker fan in the fanfiction, his new look could be really different. He would probably ditch his orange jumpsuit for something more in line with the Joker's style. A long, tattered purple coat perhaps, with some dark makeup around his eyes to give him that menacing look. His shoes could be replaced with some clown - like shoes, and he might carry around a few 'joker - ish' accessories like a deck of cards or a fake flower that sprays water. His overall appearance would be a blend of his ninja - like physique and the Joker's flamboyant and chaotic style.
Yes, there are quite a few. Some fanfictions might explore a scenario where the Joker somehow gets transported to the Naruto universe. He could create chaos in the ninja villages, which would be an interesting contrast to the more traditional Naruto storylines.