Yes, it could be a very interesting creative crossover. Naruto and Hinata are from the Naruto universe, and the Joker is from the DC Comics world. In a fanfiction, you could have the Joker somehow end up in the Naruto world. Maybe he tries to cause chaos in Konoha, and Naruto and Hinata have to work together to stop him. It would be a unique combination of different story elements.
One possible plot could be that the Joker discovers a way to travel between universes and ends up in the Naruto world. He decides to target Konoha because it seems like a place full of order that he wants to disrupt. Naruto and Hinata notice the strange new presence in the village. They initially underestimate the Joker, but as he starts causing mayhem, they realize they need to combine their skills to stop him.
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.
In some Naruto fanfictions, Hinata could potentially be portrayed as a 'weapon' in a very metaphorical sense. For example, her Byakugan abilities might be exploited in unique ways that make her seem like a strategic weapon for a side or a cause. But in the canon Naruto story, she is a character with her own agency and not really a weapon.
One great source for Naruto and Hinata fanfiction could be FanFiction.net. You can search for stories specifically focused on their relationship there. There are often new and interesting takes on their story, from how they first fell in love to their married life in the future.
Perhaps in the fanfiction, Hinata wears a micro bikini for a special festival in the Hidden Leaf Village. Naruto is really excited to see her in it. They participate in the festival games together and Hinata's new look makes Naruto see her in a different light, more as a strong and confident woman.
One possible plotline could be a story where Naruto has to choose between two versions of Hinata, the original Hinata and a version from an alternate RTN (Road to Ninja) universe. Maybe in this fanfiction, the different Hinatas have unique abilities or personalities that make Naruto's choice more difficult.
In many Naruto x Hinata Hyuga fanfictions, their relationship is often explored in greater depth. Usually, it emphasizes Hinata's long - standing admiration for Naruto. Her shy yet determined love for him is a central theme. Writers might show how Naruto gradually realizes Hinata's true feelings and how their relationship evolves from friends to something more romantic.
Another way is to join fanfiction communities or forums dedicated to Naruto. Ask the members for recommendations. They can point you to some great stories that don't involve any forced relationships. Some members might even have their own collections of fanfictions that they can share with you, which are often carefully curated and free of inappropriate content.