A cool idea could be that 'Harry' has to train in a special dojo to master his new Naruto - like powers. Ginny, like Hinata, secretly watches him train and leaves him little notes of encouragement. Another idea is that there is a prophecy about 'Harry' just like in the Harry Potter series, but this time it's related to his Naruto - esque abilities. Ginny is the one who believes in him the most when others doubt. They could also go on a journey together to find a magical artifact that is crucial for saving their world, and during this journey, their feelings for each other grow stronger.
One concept could be that the wizarding world and the ninja world have merged in this fanfiction. 'Harry' as Naruto is the key to bringing balance to this new world. Ginny as Hinata has a special ability that only she knows about that can help 'Harry' in his quest. Their relationship could be a slow - burn one, where Ginny is constantly in the background supporting 'Harry', and as time passes, 'Harry' realizes how important she is to him. For example, when 'Harry' is facing a powerful enemy, Ginny uses her hidden ability to turn the tide of the battle, and from that moment on, 'Harry' starts to see her in a new light.
One possible plot could be that in this crossover world, 'Harry' as Naruto has to face the same kind of challenges Naruto did in his own world, like protecting the village. But with Ginny as Hinata, their relationship could develop in a unique way. Maybe Ginny, like Hinata, is shy at first in expressing her feelings towards 'Harry' but gradually becomes more confident as she sees 'Harry' grow into a great leader. And they could team up to fight against common enemies who threaten their 'village' which could be a mix of elements from both the Harry Potter and Naruto universes.
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 idea could be that Naruto takes Hinata to a beautiful flower field for their date. They could have a picnic there, with Hinata shyly sharing her homemade onigiri with Naruto. As they sit on the soft grass, Naruto might tell Hinata some of his adventures outside the village, making her eyes shine with admiration.
In a fanfiction, a cat could be a messenger from another dimension. It comes to Naruto and Hinata, choosing them specifically. The cat leads them on an adventure to save the other dimension. Along the way, Naruto and Hinata's relationship blossoms as they rely on each other and face challenges together with the help of the cat.
Another fanfiction could revolve around a festival in the Hidden Leaf Village. Naruto, Hinata, and Hana participate in different festival activities. Hinata might be shy at first but with Naruto's encouragement and Hana's friendly nature, they all have a great time. It could also include some romantic moments between Naruto and Hinata in this festive setting.
A fanfiction could explore Himawari starting to show signs of her own unique ninja abilities, and Naruto and Hinata trying to figure out the best way to help her develop them. Maybe she has an ability that neither of them has seen before, which causes some confusion and also excitement in the family.
One idea could be a story where Sasuke, Hinata and Naruto are on a joint mission. Naruto's cheerfulness, Hinata's gentle strength, and Sasuke's brooding nature create an interesting dynamic. They face a powerful enemy and have to learn to combine their unique skills, like Naruto's Rasengan, Hinata's Gentle Fist, and Sasuke's Chidori, to defeat it.
One idea could be a story where Harry and Ginny are married and they take Gabrielle under their wing as a sort of apprentice in magic. Maybe Gabrielle is having trouble at Beauxbatons and they offer to help her improve her skills.
One idea could be a story where Harry and Ginny revisit the places that were significant to their relationship on their anniversary. For example, they could go back to the Burrow and relive old memories. Another idea is that they host a big anniversary party at Hogwarts, inviting all their friends and family. They could also have a private, magical adventure just the two of them, perhaps exploring a new, hidden part of the wizarding world.
One idea could be that in the fanfiction, Hinata is under the influence of a powerful genjutsu. This genjutsu makes her see Naruto as a threat to the Hidden Leaf village. So, she betrays him to protect the village in her distorted view. It could lead to a lot of inner conflict for Hinata once she realizes the truth and Naruto having to deal with the pain of her betrayal.