One idea could be that Naruto somehow gets transported into the world of Jackie Chan Adventures. He teams up with Jackie to fight the demons from the show. Naruto's ninjutsu skills would be a great addition to their battles.
Well, they could go on an adventure to find a lost pet in the village. Naruto's enthusiasm and Hinata's gentle nature would make it an interesting story. They'd search everywhere, from the rooftops to the back alleys. Along the way, they might run into some other village kids and have some mini - adventures with them too.
He might encounter unique and dangerous beasts in Uzushiogakure. Fanfiction often has new and exciting creatures for the protagonist to face, and Uzushiogakure's different environment could be home to such beasts.
First, decide on a central plot. For example, you could have Naruto and Jackie meet in a strange dimension. Then, focus on how their different skills will interact. Naruto's shadow clones could be used in creative ways during Jackie's battles.
In a fanfic, perhaps Naruto, Hinata, and Shion are sent on a joint mission to a far - off land. Hinata is initially shy around Shion, but as they travel, they start to understand each other better. Naruto, on the other hand, is his usual enthusiastic self. They encounter an ancient and powerful enemy that can only be defeated by combining their unique skills. Shion uses her prophecy powers, Hinata her Gentle Fist technique, and Naruto his Rasengan. In the end, they succeed and return to the village as heroes.
He could have adventures in Hera's realm. Maybe he has to face mythical creatures there to prove himself worthy of his new heritage. For example, he might encounter centaurs or minotaurs and have to use his ninja skills combined with any new powers from Hera to defeat them.
Maybe they'd embark on a mission to stop a new threat that's related to Naruto's past. Kid Naruto would be all excited and ready to fight, while adult Naruto would use his wisdom and more powerful skills to lead the way. They could also meet some of Naruto's old friends as kids and have some really fun interactions.
Naruto could potentially find some ancient ninja artifacts on the deserted island. These artifacts could hold great power or knowledge. He would then have to figure out how to use or protect them. There could also be some sort of mystery on the island, like a hidden cave with strange markings. Naruto, being the curious and adventurous type, would surely try to solve the mystery. This could lead to him learning new jutsu or uncovering secrets about the ninja world's past.