It could start with Naruto being kidnapped by an unknown organization. They use some sort of chakra - based technology to rewrite his memories and turn him into a killing machine, much like the Winter Soldier. His eyes might change to be more cold - looking, like the Winter Soldier's blank stare.
In this fanfiction, Naruto might have the same kind of combat skills as the Winter Soldier. He could be stealthy and efficient in combat, using his ninja skills in new and unexpected ways. For example, his shadow clones could be used to create distractions like the Winter Soldier's misdirection tactics. And his journey to break free from the control that has been imposed on him would be an interesting plot point.
His lightsaber might have a blade that is constantly changing in shape and intensity, just like his unpredictable ninja skills. The hilt could be made from a special metal found in his world, perhaps with a chakra - infused gem at the center. The color of the blade could be blue, representing his loyalty and trustworthiness, and it could also emit a faint glow that corresponds to his own chakra signature.
It could be quite interesting. Naruto, being the energetic and friendly ninja, would probably be very curious about Nami. He might ask her a million questions about the sea and her world. Nami, on the other hand, would likely be initially cautious but soon be charmed by Naruto's positive attitude. For example, Naruto could show Nami some of his cool ninja tricks, and Nami could show Naruto how she uses her Clima - Tact to control the weather.
In a more serious scenario, if they were in a fight together. Naruto's quick thinking and ability to adapt in battle, combined with Bulma's strategic mind when it comes to using her technology, would make them a formidable team. For instance, Naruto could use his shadow clones to distract the enemy while Bulma sets up a powerful energy - based weapon she's created. They would communicate in a unique way, Naruto with his straightforward and passionate style, and Bulma with her more scientific and sometimes sassy approach.
A Gintama and Naruto crossover fanfiction could be really interesting. It might start with Naruto characters somehow ending up in the Gintama world. Maybe Naruto and his friends are on a strange mission and get sucked through a portal into Edo. They would be shocked by the wacky and modern - yet still somewhat feudal - nature of the Gintama world. Gintoki could mistake them for some new weirdoes in town. And then there could be all kinds of chaos as Naruto tries to use his jutsu, which might have unexpected effects in the Gintama universe due to its different rules of physics and such.
In this crossover fanfiction, the art styles could also blend in an interesting way. The distinct anime - like look of Naruto characters against the more urban and gritty style of the Boondocks. Story - wise, perhaps there's a common enemy that both Naruto and the Boondocks characters have to face together. It could be someone who wants to disrupt both the ninja world and the Boondocks' community, forcing them to team up and use their combined skills and knowledge to defeat it.
In a Naruto and Hanabi marriage fanfiction, it could start with Naruto realizing his deep connection with Hanabi over time. Maybe they bond during a joint mission to protect the Hidden Leaf. Hanabi, with her strong Byakugan abilities, and Naruto, with his Nine - Tails chakra, would make a powerful couple. Their marriage could bring a new era of peace and unity to the village as they combine their skills and influence.
He would look quite dashing. The suit would give him a more sophisticated and grown - up appearance. His spiky hair might be a bit of a contrast to the formal attire, but that would just add to his unique charm. Maybe he'd have a black suit with a red tie, similar to some of the stylish looks in the Hidden Leaf Village.
It could be a story where Naruto has to abide by the Ten Commandments in his ninja world. For example, he might face challenges where his normal ninja actions like using deception in battle would be questioned in the light of 'thou shalt not lie'.
It could be really exciting. Maybe Naruto and his friends find themselves in the Pokemon world. Naruto might try to catch Pokemon using his ninja skills. He could use his shadow clone jutsu to surround a wild Pokemon and then throw a Pokeball. And the Pokemon in this crossover could learn some ninja - like moves. For example, Pikachu could learn how to move as fast as Naruto does.