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.
A simple plot could be that Hinata gets injured while on a mission, and Naruto takes it upon himself to nurse her back to health. During this time, they have long conversations and get to know each other on a deeper level, leading to the start of their romantic relationship.
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.
The plot could involve Naruto protecting Hinata from the Hyuga clan's strict traditions. Since he's not bound by those traditions as her brother, he could fight against the elders who want to keep Hinata in a subservient role.
It could be about Naruto and Hinata going on a secret adventure together. Maybe they discover a hidden place in Konoha that no one else knows about and have to protect it from some sort of threat.
In a 'Naruto and Hinata reborn fanfiction', perhaps they are reborn with enhanced abilities. They might be reborn into a world where ninjutsu works differently. Naruto could be more in touch with his Uzumaki heritage from the start, and Hinata might have a new form of Byakugan. They would have to learn how to use these new powers together, and also navigate their relationship, which may be different from their past life due to different circumstances.
One possibility could be that in the fanfiction, Naruto has realized Hinata's unwavering love and support over the years. So, he starts to obey her out of respect and love. For example, Hinata might suggest a new training method for Naruto, and he obeys without question because he trusts her judgment. It could also involve Hinata having a say in Naruto's decisions regarding the village, as she is also a respected ninja.
Well, it could be that Naruto, with his ninja skills, sees the Joker causing chaos in his world which has somehow merged with the DC universe. He might use his Rasengan to take down the Joker. Maybe the Joker has a new evil plan involving stealing chakra or something, and Naruto just won't stand for it.
Well, it could be that there is a masked ball in the Hidden Leaf Village. Naruto and Hinata attend it. Naruto doesn't recognize Hinata at first because of her mask. Hinata, on the other hand, is shy but determined to have a moment with Naruto. As the night progresses, they start to dance and gradually realize who the other is. This fanfiction could focus on the sweet and awkward moments of their encounter at the ball.
The plot could be that Naruto, in his fox form, gets lost in a strange land where Hinata, as a bunny, is the local guide. She shows him around, and they start to bond over their shared love for nature. As they explore, they discover an ancient mystery related to their two species and must work together to solve it.
In a 'naruto and hinata grown up fanfiction', perhaps they go on adventures outside of the village. Naruto has always been curious about the world, and now with Hinata by his side, they explore different lands. Along the way, they meet new friends and foes, and Hinata's gentle yet strong nature helps them out of many difficult situations.